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what type of css is used to format a single website page

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Style sail language

Cascading Style Sheets (CSS)
CSS3 logo and wordmark.svg
Filename extension

.css
Internet media type

text/css
Uniform Blazon Identifier (UTI) public.css
Developed by World Wide Web Consortium (W3C)
Initial release 17 Dec 1996; 25 years ago  (1996-12-17)
Latest release

CSS 2.1 : Level 2 Revision one
12 April 2016; five years ago  (2016-04-12)

Blazon of format Style sail linguistic communication
Container for Style rules for HTML elements (tags)
Contained by HTML Documents
Open format? Yes
Website www.w3.org/TR/CSS/#css

Cascading Fashion Sheets (CSS) is a style sheet language used for describing the presentation of a document written in a markup language such every bit HTML.[one] CSS is a cornerstone technology of the World Wide Web, alongside HTML and JavaScript.[2]

CSS is designed to enable the separation of presentation and content, including layout, colors, and fonts.[three] This separation can meliorate content accessibility; provide more flexibility and command in the specification of presentation characteristics; enable multiple spider web pages to share formatting by specifying the relevant CSS in a dissever .css file, which reduces complication and repetition in the structural content; and enable the .css file to exist cached to improve the page load speed between the pages that share the file and its formatting.

Separation of formatting and content also makes it feasible to present the same markup folio in different styles for different rendering methods, such equally on-screen, in print, by vocalisation (via speech-based browser or screen reader), and on Braille-based tactile devices. CSS as well has rules for alternate formatting if the content is accessed on a mobile device.[four]

The name cascading comes from the specified priority scheme to decide which fashion rule applies if more than than one rule matches a particular element. This cascading priority scheme is predictable.

The CSS specifications are maintained past the World Wide Web Consortium (W3C). Internet media type (MIME type) text/css is registered for use with CSS by RFC 2318 (March 1998). The W3C operates a gratis CSS validation service for CSS documents.[5]

In add-on to HTML, other markup languages support the employ of CSS including XHTML, manifestly XML, SVG, and XUL.

Syntax [edit]

CSS has a simple syntax and uses a number of English language keywords to specify the names of various way properties.

A style sail consists of a list of rules. Each rule or rule-gear up consists of one or more selectors, and a declaration block.

Selector [edit]

In CSS, selectors declare which part of the markup a manner applies to past matching tags and attributes in the markup itself.

Selectors may employ to the post-obit:

  • all elements of a specific type, e.yard. the 2nd-level headers h2
  • elements specified by attribute, in particular:
    • id: an identifier unique within the document, identified with a hash prefix e.1000. #id
    • class: an identifier that can annotate multiple elements in a document, identified with a period prefix e.1000. .classname
  • elements depending on how they are placed relative to others in the document tree.

Classes and IDs are case-sensitive, offset with letters, and tin include alphanumeric characters, hyphens, and underscores. A grade may apply to any number of instances of any elements. An ID may just exist applied to a single element.

Pseudo-classes are used in CSS selectors to permit formatting based on information that is non independent in the document tree. One example of a widely used pseudo-class is : hover , which identifies content only when the user "points to" the visible element, usually past holding the mouse cursor over it. It is appended to a selector as in a : hover or # elementid : hover . A pseudo-class classifies document elements, such every bit : link or : visited , whereas a pseudo-chemical element makes a selection that may consist of partial elements, such as :: first-line or :: first-letter of the alphabet .[vi]

Selectors may be combined in many ways to accomplish corking specificity and flexibility.[vii] Multiple selectors may be joined in a spaced list to specify elements by location, element type, id, course, or whatsoever combination thereof. The society of the selectors is of import. For example, div . myClass { color : carmine ;} applies to all elements of form myClass that are inside div elements, whereas . myClass div { colour : red ;} applies to all div elements that are inside elements of class myClass. This is not to be confused with concatenated identifiers such as div . myClass { color : ruby ;} which applies to div elements of class myClass.

The following table provides a summary of selector syntax indicating usage and the version of CSS that introduced it.[8]

Pattern Matches First defined
in CSS level
East an element of type E 1
E : link an Due east chemical element is the source ballast of a hyperlink of which the target is not nonetheless visited (:link) or already visited (:visited) 1
E : active an E chemical element during certain user deportment 1
E :: kickoff-line the starting time formatted line of an E chemical element one
E :: commencement-letter the start formatted alphabetic character of an E chemical element 1
. c all elements with form="c" i
# myid the element with id="myid" 1
E . warning an East element whose class is "warning" (the document language specifies how class is determined) i
E # myid an Due east element with ID equal to "myid" one
. c # myid the chemical element with grade="c" and ID equal to "myid" 1
E F an F element descendant of an Due east element 1
* any element ii
E [ foo ] an E element with a "foo" attribute 2
E [ foo = "bar" ] an Due east element whose "foo" aspect value is exactly equal to "bar" 2
E [ foo ~= "bar" ] an E element whose "foo" attribute value is a list of whitespace-separated values, one of which is exactly equal to "bar" two
Eastward [ foo |= "en" ] an E chemical element whose "foo" attribute has a hyphen-separated list of values beginning (from the left) with "en" 2
E : showtime-child an E element, first child of its parent 2
Eastward : lang ( fr ) an element of type E in linguistic communication "fr" (the document language specifies how language is determined) 2
E :: before generated content before an E element'southward content 2
E :: after generated content after an E chemical element's content 2
E > F an F element kid of an E element two
E + F an F element immediately preceded by an E element 2
E [ foo ^= "bar" ] an E element whose "foo" attribute value begins exactly with the string "bar" 3
E [ foo $= "bar" ] an Eastward element whose "foo" attribute value ends exactly with the string "bar" 3
E [ foo *= "bar" ] an Eastward element whose "foo" attribute value contains the substring "bar" 3
E : root an E element, root of the document 3
E : nth-child ( due north ) an E chemical element, the north-th child of its parent 3
E : nth-last-kid ( n ) an E chemical element, the due north-th child of its parent, counting from the last one iii
Eastward : nth-of-blazon ( n ) an Due east element, the n-thursday sibling of its type 3
E : nth-last-of-type ( n ) an Due east element, the northward-th sibling of its type, counting from the last one 3
E : terminal-child an E element, final child of its parent 3
E : first-of-type an E chemical element, start sibling of its type iii
East : concluding-of-blazon an E element, terminal sibling of its type 3
E : just-kid an E element, simply child of its parent 3
E : only-of-type an E element, only sibling of its type 3
Due east : empty an Due east element that has no children (including text nodes) three
E : target an E chemical element being the target of the referring URI 3
E : enabled a user interface element Due east that is enabled 3
E : disabled a user interface element E that is disabled 3
E : checked a user interface element East that is checked (for instance a radio-button or checkbox) iii
East : non ( s ) an E element that does not match uncomplicated selector s iii
E ~ F an F chemical element preceded past an E element 3

Declaration block [edit]

A annunciation block consists of a list of declarations in braces. Each announcement itself consists of a property, a colon (:), and a value. If in that location are multiple declarations in a cake, a semi-colon (;) must exist inserted to separate each declaration. An optional semi-colon after the terminal (or single) annunciation may be used.[9]

Properties are specified in the CSS standard. Each belongings has a set of possible values. Some backdrop can affect any type of chemical element, and others apply only to particular groups of elements.[x] [11]

Values may exist keywords, such equally "heart" or "inherit", or numerical values, such as 200px (200 pixels), 50vw (50 percent of the viewport width) or lxxx% (80 percent of the parent element's width). Color values can be specified with keywords (e.g. "crimson"), hexadecimal values (e.thousand. #FF0000, also abbreviated as #F00), RGB values on a 0 to 255 scale (e.g. rgb(255, 0, 0) ), RGBA values that specify both color and blastoff transparency (e.k. rgba(255, 0, 0, 0.8)), or HSL or HSLA values (e.g. hsl(000, 100%, fifty%), hsla(000, 100%, l%, 80%)).[12]

Length units [edit]

Non-nil numeric values representing linear measures must include a length unit, which is either an alphabetic code or abbreviation, equally in 200px or 50vw; or a percentage sign, every bit in eighty%. Some units – cm (centimetre); in (inch); mm (millimetre); pc (pica); and pt (bespeak) – are absolute, which means that the rendered dimension does not depend upon the structure of the page; others – em (em); ex (ex) and px (pixel)[ clarification needed ] – are relative, which means that factors such as the font size of a parent element tin bear on the rendered measurement. These 8 units were a feature of CSS 1[thirteen] and retained in all subsequent revisions. The proposed CSS Values and Units Module Level iii will, if adopted as a W3C Recommendation, provide seven further length units: ch; Q; rem; vh; vmax; vmin; and vw.[14]

Utilise [edit]

Before CSS, nearly all presentational attributes of HTML documents were contained within the HTML markup. All font colors, background styles, element alignments, borders and sizes had to be explicitly described, often repeatedly, inside the HTML. CSS lets authors move much of that data to another file, the style sheet, resulting in considerably simpler HTML.

For instance, headings (h1 elements), sub-headings (h2), sub-sub-headings (h3), etc., are defined structurally using HTML. In impress and on the screen, choice of font, size, colour and emphasis for these elements is presentational.

Before CSS, certificate authors who wanted to assign such typographic characteristics to, say, all h2 headings had to repeat HTML presentational markup for each occurrence of that heading blazon. This fabricated documents more complex, larger, and more error-prone and hard to maintain. CSS allows the separation of presentation from structure. CSS can define colour, font, text alignment, size, borders, spacing, layout and many other typographic characteristics, and can do then independently for on-screen and printed views. CSS also defines non-visual styles, such as reading speed and emphasis for audible text readers. The W3C has now deprecated the apply of all presentational HTML markup.[fifteen]

For example, nether pre-CSS HTML, a heading chemical element defined with ruddy text would exist written as: 

                        <            h1            ><            font            color            =            "reddish"            >Chapter one.</            font            ></            h1            >

Using CSS, the same element can exist coded using style backdrop instead of HTML presentational attributes: 

                        <            h1            mode            =            "color: red;"            >Affiliate one.</            h1            >

The advantages of this may non be immediately articulate simply the power of CSS becomes more apparent when the mode properties are placed in an internal style element or, even ameliorate, an external CSS file. For example, suppose the document contains the style element: 

                        <            style            >            h1            {            color            :            scarlet            ;            }            </            manner            >

All h1 elements in the document volition then automatically become cerise without requiring any explicit lawmaking. If the author after wanted to brand h1 elements blue instead, this could be washed by changing the style chemical element to: 

                        <            mode            >            h1            {            color            :            bluish            ;            }            </            manner            >

rather than by laboriously going through the document and changing the color for each private h1 element.

The styles tin can too be placed in an external CSS file, as described below, and loaded using syntax like to: 

                        <            link            href            =            "path/to/file.css"            rel            =            "stylesheet"            type            =            "text/css"            >

This farther decouples the styling from the HTML certificate and makes it possible to restyle multiple documents by only editing a shared external CSS file.

Sources [edit]

CSS data can be provided from various sources. These sources tin can be the web browser, the user, and the author. The information from the author can exist farther classified into inline, media type, importance, selector specificity, rule social club, inheritance, and property definition. CSS style data can exist in a separate document, or it tin be embedded into an HTML document. Multiple manner sheets can be imported. Different styles tin be applied depending on the output device beingness used; for example, the screen version can be quite different from the printed version, so that authors can tailor the presentation appropriately for each medium.

The style canvas with the highest priority controls the content display. Declarations not ready in the highest priority source are passed on to a source of lower priority, such as the user agent manner. The procedure is called cascading.

One of the goals of CSS is to let users greater command over presentation. Someone who finds carmine italic headings difficult to read may utilize a different style sheet. Depending on the browser and the web site, a user may choose from various fashion sheets provided by the designers, or may remove all added styles and view the site using the browser's default styling, or may override merely the red italic heading style without altering other attributes.

CSS priority scheme (highest to lowest)
Priority CSS source type Clarification
one Importance The " ! important " annotation overwrites the previous priority types
ii Inline A style applied to an HTML element via HTML "style" attribute
3 Media Type A property definition applies to all media types, unless a media specific CSS is defined
4 User defined Nearly browsers have the accessibility feature: a user divers CSS
5 Selector specificity A specific contextual selector ( # heading p ) overwrites generic definition
half dozen Rule order Last rule declaration has a college priority
7 Parent inheritance If a property is not specified, it is inherited from a parent element
eight CSS property definition in HTML document CSS rule or CSS inline style overwrites a default browser value
9 Browser default The lowest priority: browser default value is adamant by W3C initial value specifications

Specificity [edit]

Specificity refers to the relative weights of various rules.[16] Information technology determines which styles apply to an element when more than i rule could employ. Based on specification, a simple selector (e.g. H1) has a specificity of 1, form selectors have a specificity of i,0, and ID selectors a specificity of 1,0,0. Because the specificity values do not conduct over as in the decimal organisation, commas are used to split up the "digits"[17] (a CSS rule having 11 elements and 11 classes would have a specificity of 11,eleven, non 121).

Thus the following rules selectors result in the indicated specificity:

Selectors Specificity
h1 { color : white ;} 0, 0, 0, 1
p em { color : greenish ;} 0, 0, 0, 2
. grape { color : red ;} 0, 0, 1, 0
p . brilliant { color : blue ;} 0, 0, 1, 1
p . brilliant em . dark { color : yellow ;} 0, 0, 2, ii
# id218 { colour : brown ;} 0, 1, 0, 0
style = " " ane, 0, 0, 0

Examples [edit]

Consider this HTML fragment: 

                        <!DOCTYPE html>            <            html            >            <            head            >            <            meta            charset            =            "utf-8"            >            <            style            >            #            xyz            {            colour            :            blue            ;            }            </            style            >            </            head            >            <            body            >            <            p            id            =            "xyz"            style            =            "color: green;"            >To demonstrate specificity</            p            >            </            torso            >            </            html            >

In the above example, the announcement in the style attribute overrides the one in the <style> element because it has a college specificity, and thus, the paragraph appears green:

To demonstrate specificity

Inheritance [edit]

Inheritance is a key feature in CSS; it relies on the ancestor-descendant relationship to operate. Inheritance is the machinery by which backdrop are applied not merely to a specified element, but also to its descendants.[16] Inheritance relies on the document tree, which is the bureaucracy of XHTML elements in a page based on nesting. Descendant elements may inherit CSS property values from any ancestor element enclosing them. In general, descendant elements inherit text-related properties, but their box-related properties are non inherited. Properties that tin be inherited are color, font, letter-spacing, line-elevation, list-fashion, text-align, text-indent, text-transform, visibility, white-infinite and word-spacing. Properties that cannot be inherited are groundwork, border, display, float and clear, superlative, and width, margin, min- and max-top and -width, outline, overflow, padding, position, text-decoration, vertical-align and z-index.

Inheritance tin be used to avoid declaring certain properties over and once again in a mode sail, allowing for shorter CSS.

Inheritance in CSS is not the same as inheritance in course-based programming languages, where it is possible to define form B as "similar grade A, but with modifications".[18] With CSS, it is possible to style an element with "grade A, but with modifications". Notwithstanding, it is not possible to define a CSS class B similar that, which could then be used to mode multiple elements without having to repeat the modifications.

Case [edit]

Given the following way sheet:

Suppose there is an h1 chemical element with an emphasizing element (<em>) within: 

                        <            h1            >            This is to            <            em            >illustrate</            em            >            inheritance            </            h1            >

If no color is assigned to the em chemical element, the emphasized word "illustrate" inherits the color of the parent chemical element, h1. The style sheet h1 has the color pinkish, hence, the em element is too pink:

This is to illustrate inheritance

Whitespace [edit]

Whitespace between properties and selectors is ignored. This code snippet: 

                        body            {            overflow            :            hidden            ;            background            :            #000000            ;            background-prototype            :            url            (            images/bg.gif            );            background-repeat            :            no-repeat            ;            groundwork-position            :            left            tiptop            ;}

is functionally equivalent to this one: 

                        torso            {            overflow            :            hidden            ;            groundwork-color            :            #000000            ;            background-prototype            :            url            (            images/bg.gif            );            background-repeat            :            no-echo            ;            groundwork-position            :            left            top            ;            }

Ane common way to format CSS for readability is to indent each belongings and give information technology its own line. In addition to formatting CSS for readability, shorthand properties can be used to write out the code faster, which also gets processed more quickly when existence rendered:[19] 

                        trunk            {            overflow            :            hidden            ;            groundwork            :            #000            url            (            images/bg.gif            )            no-repeat            left            top            ;            }

Sometimes, multiple property values are indented onto their ain line:

                        @            font-face            {            font-family            :            'Comic Sans'            font-size            :            20px            src            :            url            (            'first.example.com'            ),            url            (            '2d.case.com'            ),            url            (            'third.instance.com'            ),            url            (            'quaternary.instance.com'            ),            }

Positioning [edit]

CSS ii.1 defines iii positioning schemes:

Normal flow
Inline items are laid out in the same mode as the messages in words in text, one later on the other across the bachelor infinite until at that place is no more room, then starting a new line below. Block items stack vertically, like paragraphs and like the items in a bulleted list. Normal flow also includes relative positioning of block or inline items, and run-in boxes.
Floats
A floated item is taken out of the normal menses and shifted to the left or right as far as possible in the space available. Other content and so flows alongside the floated item.
Absolute positioning
An absolutely positioned item has no place in, and no consequence on, the normal menstruum of other items. It occupies its assigned position in its container independently of other items.[twenty]

Position property [edit]

In that location are five possible values of the position property. If an item is positioned in whatsoever manner other than static , then the further properties acme , bottom , left , and correct are used to specify offsets and positions.The element having position static is not affected by the top , bottom , left or right properties.

Static
The default value places the detail in the normal menses
Relative
The item is placed in the normal catamenia, and and so shifted or offset from that position. Subsequent menstruation items are laid out every bit if the item had non been moved.
Absolute
Specifies absolute positioning. The chemical element is positioned in relation to its nearest non-static ancestor.
Fixed
The detail is absolutely positioned in a fixed position on the screen even every bit the rest of the document is scrolled[xx]

Float and clear [edit]

The float property may have i of iii values. Absolutely positioned or stock-still items cannot be floated. Other elements unremarkably flow around floated items, unless they are prevented from doing then past their clear property.

left
The item floats to the left of the line that information technology would take appeared in; other items may catamenia effectually its right side.
right
The item floats to the right of the line that it would have appeared in; other items may flow around its left side.
clear
Forces the element to appear underneath ('clear') floated elements to the left ( clear : left ), right ( clear : right ) or both sides ( articulate : both ).[twenty] [21]

History [edit]

Håkon Wium Lie, chief technical officer of the Opera Software company and co-creator of the CSS web standards

CSS was beginning proposed by Håkon Wium Prevarication on ten October 1994.[22] At the time, Lie was working with Tim Berners-Lee at CERN.[23] Several other style sheet languages for the web were proposed effectually the same fourth dimension, and discussions on public mailing lists and within World wide web Consortium resulted in the first W3C CSS Recommendation (CSS1)[24] existence released in 1996. In particular, a proposal past Bert Bos was influential; he became co-writer of CSS1, and is regarded as co-creator of CSS.[25]

Style sheets have existed in one form or another since the beginnings of Standard Generalized Markup Language (SGML) in the 1980s, and CSS was developed to provide style sheets for the web.[26] I requirement for a spider web fashion sheet linguistic communication was for style sheets to come from unlike sources on the spider web. Therefore, existing style canvass languages like DSSSL and FOSI were not suitable. CSS, on the other manus, let a document's style be influenced by multiple style sheets by way of "cascading" styles.[26]

Equally HTML grew, it came to embrace a wider variety of stylistic capabilities to meet the demands of spider web developers. This evolution gave the designer more control over site appearance, at the price of more complex HTML. Variations in spider web browser implementations, such as ViolaWWW and WorldWideWeb,[27] made consistent site appearance difficult, and users had less control over how spider web content was displayed. The browser/editor developed past Tim Berners-Lee had style sheets that were hard-coded into the program. The style sheets could therefore not exist linked to documents on the web.[23] Robert Cailliau, also of CERN, wanted to separate the structure from the presentation and then that different mode sheets could describe different presentation for printing, screen-based presentations, and editors.[27]

Improving web presentation capabilities was a topic of involvement to many in the spider web community and nine different style sheet languages were proposed on the world wide web-style mailing list.[26] Of these nine proposals, two were especially influential on what became CSS: Cascading HTML Style Sheets[22] and Stream-based Style Sheet Proposal (SSP).[25] [28] Ii browsers served as testbeds for the initial proposals; Prevarication worked with Yves Lafon to implement CSS in Dave Raggett'south Arena browser.[29] [30] [31] Bert Bos implemented his own SSP proposal in the Argo browser.[25] Thereafter, Lie and Bos worked together to develop the CSS standard (the 'H' was removed from the name considering these style sheets could also be practical to other markup languages besides HTML).[23]

Prevarication'due south proposal was presented at the "Mosaic and the Web" conference (after called WWW2) in Chicago, Illinois in 1994, and over again with Bert Bos in 1995.[23] Around this time the W3C was already being established, and took an interest in the development of CSS. Information technology organized a workshop toward that end chaired by Steven Pemberton. This resulted in W3C adding piece of work on CSS to the deliverables of the HTML editorial review board (ERB). Lie and Bos were the primary technical staff on this aspect of the project, with boosted members, including Thomas Reardon of Microsoft, participating as well. In August 1996, Netscape Communication Corporation presented an culling style sheet language called JavaScript Style Sheets (JSSS).[23] The spec was never finished, and is deprecated.[32] Past the end of 1996, CSS was set up to get official, and the CSS level 1 Recommendation was published in December.

Development of HTML, CSS, and the DOM had all been taking place in one group, the HTML Editorial Review Lath (ERB). Early in 1997, the ERB was split into iii working groups: HTML Working group, chaired by Dan Connolly of W3C; DOM Working grouping, chaired by Lauren Forest of SoftQuad; and CSS Working group, chaired by Chris Lilley of W3C.

The CSS Working Group began tackling bug that had not been addressed with CSS level 1, resulting in the creation of CSS level 2 on November 4, 1997. It was published as a W3C Recommendation on May 12, 1998. CSS level 3, which was started in 1998, is notwithstanding nether development as of 2014.

In 2005, the CSS Working Groups decided to enforce the requirements for standards more strictly. This meant that already published standards like CSS 2.one, CSS three Selectors, and CSS 3 Text were pulled back from Candidate Recommendation to Working Typhoon level.

Difficulty with adoption [edit]

The CSS ane specification was completed in 1996. Microsoft'due south Internet Explorer three[23] was released in that year, featuring some limited support for CSS. IE four and Netscape 4.x added more than support, just it was typically incomplete and had many bugs that prevented CSS from being usefully adopted. It was more than iii years before any web browser achieved near-total implementation of the specification. Internet Explorer 5.0 for the Macintosh, shipped in March 2000, was the kickoff browser to have total (better than 99 pct) CSS 1 back up,[33] surpassing Opera, which had been the leader since its introduction of CSS support 15 months earlier. Other browsers followed soon afterward, and many of them additionally implemented parts of CSS 2.[ commendation needed ]

However, even when later 'version 5' spider web browsers began to offer a adequately full implementation of CSS, they were still incorrect in certain areas and were fraught with inconsistencies, bugs and other quirks. Microsoft Internet Explorer five.x for Windows, as opposed to the very unlike IE for Macintosh, had a flawed implementation of the 'CSS box model', as compared with the CSS standards. Such inconsistencies and variation in feature support made it difficult for designers to achieve a consistent appearance across browsers and platforms without the use of workarounds termed CSS hacks and filters. The IE/Windows box model bugs were and so serious that, when Internet Explorer six was released, Microsoft introduced a backwards-compatible mode of CSS interpretation ('quirks mode') alongside an alternative, corrected 'standards mode'. Other non-Microsoft browsers also provided such 'mode'-switch behavior capability. It therefore became necessary for authors of HTML files to ensure they independent special distinctive 'standards-compliant CSS intended' marking to show that the authors intended CSS to exist interpreted correctly, in compliance with standards, as opposed to existence intended for the now long-obsolete IE5/Windows browser. Without this marker, web browsers that accept the 'quirks mode'-switching adequacy will size objects in web pages as IE5/Windows would rather than following CSS standards.[ commendation needed ]

Problems with patchy adoption of CSS, along with errata in the original specification, led the W3C to revise the CSS 2 standard into CSS 2.1, which moved nearer to a working snapshot of current CSS back up in HTML browsers. Some CSS 2 properties that no browser successfully implemented were dropped, and in a few cases, defined behaviors were inverse to bring the standard into line with the predominant existing implementations. CSS ii.1 became a Candidate Recommendation on February 25, 2004, but CSS 2.1 was pulled back to Working Draft status on June thirteen, 2005,[34] and merely returned to Candidate Recommendation condition on July nineteen, 2007.[35]

In add-on to these problems, the .css extension was used past a software product used to catechumen PowerPoint files into Compact Slide Bear witness files,[36] so some web servers served all .css [37] as MIME type application/x-pointplus [38] rather than text/css.

Vendor prefixes [edit]

Private browser vendors occasionally introduced new parameters ahead of standardization and universalization. To prevent interfering with futurity implementations, vendors prepended unique names to the parameters, such as -moz- for Mozilla Firefox, -webkit- named subsequently the browsing engine of Apple tree Safari, -o- for Opera Browser and -ms- for Microsoft Internet Explorer.

Occasionally, the parameters with vendor prefix such every bit -moz-radial-gradient and -webkit-linear-gradient have slightly different syntax as compared to their non-vendor-prefix counterparts.[39]

Prefixed properties are rendered obsolete by the time of standardization. Programs are available to automatically add prefixes for older browsers, and to bespeak out standardized versions of prefixed parameters. Since prefixes are express to a small subset of browsers, removing the prefix allows other browsers to see the functionality. An exception is certain obsolete -webkit- prefixed properties, which are so common and persistent on the web that other families of browsers have decided to support them for compatibility.[xl]

Variations [edit]

CSS has various levels and profiles. Each level of CSS builds upon the last, typically calculation new features and typically denoted every bit CSS 1, CSS 2, CSS 3, and CSS 4. Profiles are typically a subset of one or more levels of CSS built for a detail device or user interface. Currently there are profiles for mobile devices, printers, and television sets. Profiles should not be dislocated with media types, which were added in CSS 2.

CSS 1 [edit]

The commencement CSS specification to go an official W3C Recommendation is CSS level 1, published on 17 Dec 1996. Håkon Wium Lie and Bert Bos are credited as the original developers.[41] [42] Amongst its capabilities are back up for

  • Font backdrop such every bit typeface and emphasis
  • Color of text, backgrounds, and other elements
  • Text attributes such as spacing between words, letters, and lines of text
  • Alignment of text, images, tables and other elements
  • Margin, border, padding, and positioning for most elements
  • Unique identification and generic nomenclature of groups of attributes

The W3C no longer maintains the CSS 1 Recommendation.[43]

CSS ii [edit]

CSS level ii specification was developed past the W3C and published as a recommendation in May 1998. A superset of CSS 1, CSS 2 includes a number of new capabilities similar accented, relative, and fixed positioning of elements and z-index, the concept of media types, support for aural style sheets (which were later replaced by the CSS iii voice communication modules)[44] and bidirectional text, and new font properties such as shadows.

The W3C no longer maintains the CSS 2 recommendation.[45]

CSS 2.1 [edit]

CSS level 2 revision i, often referred to as "CSS 2.one", fixes errors in CSS 2, removes poorly supported or not fully interoperable features and adds already implemented browser extensions to the specification. To comply with the W3C Process for standardizing technical specifications, CSS 2.one went back and forth betwixt Working Typhoon condition and Candidate Recommendation condition for many years. CSS 2.ane first became a Candidate Recommendation on 25 February 2004, but it was reverted to a Working Draft on thirteen June 2005 for further review. Information technology returned to Candidate Recommendation on 19 July 2007 and and so updated twice in 2009. However, considering changes and clarifications were made, information technology again went dorsum to Concluding Call Working Typhoon on seven December 2010.

CSS ii.1 went to Proposed Recommendation on 12 April 2011.[46] After beingness reviewed by the W3C Advisory Committee, it was finally published as a W3C Recommendation on 7 June 2011.[47]

CSS 2.i was planned every bit the first and final revision of level ii—but depression priority work on CSS 2.ii began in 2015.

CSS 3 [edit]

Unlike CSS two, which is a large single specification defining diverse features, CSS three is divided into several divide documents called "modules". Each module adds new capabilities or extends features divers in CSS 2, preserving backward compatibility. Work on CSS level 3 started around the time of publication of the original CSS 2 recommendation. The earliest CSS 3 drafts were published in June 1999.[48]

Due to the modularization, dissimilar modules have unlike stability and statuses.[49]

Some modules have Candidate Recommendation (CR) condition and are considered moderately stable. At CR stage, implementations are advised to drop vendor prefixes.[50]

Summary of master module-specifications[51]
Module Specification title Condition Date
css3-background CSS Backgrounds and Borders Module Level 3 Candidate Rec. Dec 2020
css3-box CSS CSS Box Model Module Level iii Candidate Rec. Dec 2020
css-pour-3 CSS Cascading and Inheritance Level three Recommendation Feb 2021
css3-color CSS Color Module Level iii Recommendation Jun 2018
css3-content CSS Generated Content Module Level iii Working Draft ii Aug 2019
css-fonts-3 CSS Fonts Module Level 3 Recommendation Sep 2018
css3-gcpm CSS Generated Content for Paged Media Module Working Draft May 2014
css3-layout CSS Template Layout Module Note Mar 2015
css3-mediaqueries Media Queries Recommendation Jun 2012
mediaqueries-4 Media Queries Level 4 Candidate Rec. Jul 2020
css3-multicol Multi-column Layout Module Level ane Working Draft Feb 2021
css3-page CSS Paged Media Module Level iii Working Typhoon, and part migrated to css3-suspension Oct 2018
css3-break CSS Fragmentation Module Level 3 Candidate Rec. Dec 2018
selectors-three Selectors Level three Recommendation Nov 2018
selectors-4 Selectors Level iv Working Draft November 2018
css3-ui CSS Basic User Interface Module Level 3 (CSS3 UI) Recommendation Jun 2018

CSS 4 [edit]

Jen Simmons discussing the state of CSS in 2019, as several CSS4 modules were existence advanced

There is no unmarried, integrated CSS4 specification,[52] because the specification has been split up into many separate modules which level independently.

Modules that build on things from CSS Level 2 started at Level three. Some of them accept already reached Level 4 or are already approaching Level 5. Other modules that define entirely new functionality, such as Flexbox,[53] have been designated every bit Level 1 and some of them are approaching Level 2.

The CSS Working Grouping sometimes publishes "Snapshots", a collection of whole modules and parts of other drafts that are considered stable enough to be implemented by browser developers. Then far, five such "best current practices" documents have been published as Notes, in 2007,[54] 2010,[55] 2015,[56] 2017,[57] and 2018.[58]

Since these specification snapshots are primarily intended for developers, there has been growing demand for as like versioned reference document targeted at authors, which would nowadays the state of interoperable implementations every bit meanwhile documented by sites like Can I Utilise…[59] and the MDN Web Docs.[sixty] A W3C Community Group has been established in early 2020 in lodge to discuss and define such a resources.[61] The actual kind of versioning is likewise up to debate, which ways that the document once produced might not be called "CSS4".

Browser back up [edit]

Each web browser uses a layout engine to render spider web pages, and support for CSS functionality is non consistent between them. Considering browsers do not parse CSS perfectly, multiple coding techniques accept been developed to target specific browsers with workarounds (commonly known as CSS hacks or CSS filters). Adoption of new functionality in CSS tin be hindered by lack of support in major browsers. For example, Internet Explorer was slow to add support for many CSS iii features, which slowed adoption of those features and damaged the browser'due south reputation amid developers.[62] In order to ensure a consistent feel for their users, web developers frequently test their sites beyond multiple operating systems, browsers, and browser versions, increasing evolution time and complication. Tools such as BrowserStack take been built to reduce the complication of maintaining these environments.

In add-on to these testing tools, many sites maintain lists of browser support for specific CSS properties, including CanIUse and the MDN Web Docs. Additionally, the CSS iii defines characteristic queries, which provide an @supports directive that volition allow developers to target browsers with support for certain functionality directly within their CSS.[63] CSS that is not supported by older browsers tin can too sometimes be patched in using JavaScript polyfills, which are pieces of JavaScript code designed to make browsers behave consistently. These workarounds—and the need to back up fallback functionality—tin add complexity to development projects, and consequently, companies frequently define a listing of browser versions that they will and will non support.

As websites adopt newer lawmaking standards that are incompatible with older browsers, these browsers tin be cut off from accessing many of the resources on the web (sometimes intentionally).[64] Many of the most popular sites on the net are not just visually degraded on older browsers due to poor CSS support, but exercise not piece of work at all, in large part due to the evolution of JavaScript and other spider web technologies.

Limitations [edit]

Some noted limitations of the current capabilities of CSS include:

Selectors are unable to ascend
CSS currently offers no way to select a parent or ancestor of an chemical element that satisfies certain criteria.[65] CSS Selectors Level iv, which is still in Working Draft status, proposes such a selector,[66] but only as part of the complete "snapshot" selector profile, not the fast "alive" profile used in dynamic CSS styling.[67] A more advanced selector scheme (such as XPath) would enable more sophisticated style sheets. The major reasons for the CSS Working Group previously rejecting proposals for parent selectors are related to browser performance and incremental rendering issues.[68]
Cannot explicitly declare new telescopic independently of position
Scoping rules for properties such as z-index await for the closest parent element with a position:absolute or position:relative attribute. This odd coupling has undesired effects. For case, it is impossible to avoid declaring a new scope when one is forced to adjust an element's position, preventing one from using the desired scope of a parent element.
Pseudo-class dynamic behavior not controllable
CSS implements pseudo-classes that allow a degree of user feedback past conditional application of alternate styles. One CSS pseudo-class, " : hover ", is dynamic (equivalent of JavaScript "onmouseover") and has potential for misuse (eastward.g., implementing cursor-proximity popups),[69] but CSS has no ability for a customer to disable information technology (no "disable"-like property) or limit its effects (no "nochange"-like values for each property).
Cannot name rules
There is no way to name a CSS dominion, which would allow (for example) client-side scripts to refer to the rule even if its selector changes.
Cannot include styles from a dominion into another rule
CSS styles often must be duplicated in several rules to achieve a desired event, causing additional maintenance and requiring more thorough testing. Some new CSS features were proposed to solve this, just were abandoned afterwards.[70] [71] Instead, authors may gain this power past using more sophisticated stylesheet languages which compile to CSS, such as Sass, Less, or Stylus.
Cannot target specific text without altering markup
Besides the : commencement-letter pseudo-chemical element, one cannot target specific ranges of text without needing to utilize place-holder elements.

One-time bug [edit]

Additionally, several more issues were present in prior versions of the CSS standard, but have been alleviated:

Vertical control limitations
Though horizontal placement of elements was always generally easy to control, vertical placement was ofttimes unintuitive, convoluted, or outright impossible. Simple tasks, such equally centering an element vertically or placing a footer no college than bottom of the viewport required either complicated and unintuitive fashion rules, or simple but widely unsupported rules.[65] The Flexible Box Module improved the situation considerably and vertical command is much more than straightforward and supported in all of the modern browsers.[72] Older browsers still have those issues, just about of those (mainly Internet Explorer nine and beneath) are no longer supported by their vendors.[73]
Absence of expressions
There was no standard ability to specify holding values as simple expressions (such equally margin-left : 10 % – 3em + 4px ; ). This would be useful in a variety of cases, such as calculating the size of columns subject field to a constraint on the sum of all columns. Net Explorer versions 5 to 7 support a proprietary expression() statement,[74] with similar functionality. This proprietary expression() statement is no longer supported from Internet Explorer 8 onwards, except in compatibility modes. This decision was taken for "standards compliance, browser performance, and security reasons".[74] All the same, a candidate recommendation with a calc() value to address this limitation has been published by the CSS WG[75] and has since been supported in all of the modern browsers.[76]
Lack of cavalcade declaration
Although possible in current CSS 3 (using the column-count module),[77] layouts with multiple columns can be complex to implement in CSS 2.one. With CSS 2.1, the process is frequently done using floating elements, which are oft rendered differently by unlike browsers, dissimilar computer screen shapes, and unlike screen ratios set on standard monitors. All of the mod browsers support this CSS 3 feature in 1 form or another.[78]

Advantages [edit]

Separation of content from presentation
CSS facilitates publication of content in multiple presentation formats based on nominal parameters. Nominal parameters include explicit user preferences, unlike spider web browsers, the type of device beingness used to view the content (a desktop estimator or mobile device), the geographic location of the user and many other variables.
Site-wide consistency
When CSS is used finer, in terms of inheritance and "cascading", a global style sheet tin can be used to affect and way elements site-wide. If the state of affairs arises that the styling of the elements should exist changed or adjusted, these changes can exist made by editing rules in the global style sail. Before CSS, this sort of maintenance was more difficult, expensive and fourth dimension-consuming.
Bandwidth
A stylesheet, internal or external, specifies the style once for a range of HTML elements selected by class, type or human relationship to others. This is much more efficient than repeating style information inline for each occurrence of the element. An external stylesheet is ordinarily stored in the browser cache, and can therefore be used on multiple pages without being reloaded, further reducing data transfer over a network.
Page reformatting
With a simple change of 1 line, a different style sheet can be used for the same page. This has advantages for accessibility, as well as providing the ability to tailor a page or site to different target devices. Furthermore, devices non able to understand the styling still display the content.
Accessibility
Without CSS, web designers must typically lay out their pages with techniques such every bit HTML tables that hinder accessibility for vision-impaired users (run into Tableless web design#Accessibility).

Standardization [edit]

Frameworks [edit]

CSS frameworks are pre-prepared libraries that are meant to allow for easier, more than standards-compliant styling of web pages using the Cascading Way Sheets language. CSS frameworks include Design, Bootstrap, Foundation and Materialize. Like programming and scripting language libraries, CSS frameworks are commonly incorporated as external .css sheets referenced in the HTML < head > . They provide a number of ready-made options for designing and laying out the web page. Although many of these frameworks accept been published, some authors use them mostly for rapid prototyping, or for learning from, and prefer to 'handcraft' CSS that is appropriate to each published site without the design, maintenance and download overhead of having many unused features in the site'south styling.[79]

Design methodologies [edit]

Equally the size of CSS resource used in a project increases, a development squad often needs to determine on a common blueprint methodology to keep them organized. The goals are ease of development, ease of collaboration during evolution and performance of the deployed stylesheets in the browser. Popular methodologies include OOCSS (object oriented CSS), ACSS (atomic CSS), oCSS (organic Cascade Way Canvas), SMACSS (scalable and modular architecture for CSS), and BEM (cake, element, modifier).[fourscore]

Run across too [edit]

  • Flash of unstyled content

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Further reading [edit]

  • Jeffrey Zeldman (2009): Designing With Web Standards, New Riders, ISBN 978-0321616951 (paperback) (book'due south companion site)
  • Dan Cederholm (2009): Web Standards Solutions, The Markup and Style Handbook, Friends of Ed, ISBN 978-1430219200 (paperback) (Author's site)
  • Meyer, Eric A. (2006). Cascading Style Sheets: The Definitive Guide, Tertiary Edition. O'Reilly Media, Inc. ISBN0-596-52733-0.
  • More Eric Meyer On CSS (2004) ISBN 0-7357-1425-8
  • Eric Meyer On CSS (2002), ISBN 0-7357-1245-X
  • Meyer, Eric A. (2001) Cascading Style Sheets two.0 Programmer's Reference, McGraw-Hill Osborne Media, ISBN 0-07-213178-0
  • The Zen of CSS Design (2005) (co-authored past CSS Zen Garden Owner, Dave Shea, and Molly E. Holzschlag), ISBN 0-321-30347-iv
  • Kynn Bartlett: Teach Yourself CSS in 24 Hours, 2nd Edition (2006), Sams Publishing, ISBN 978-0672329067
  • Cascading Way Sheets: Designing for the Web (2005) by Håkon Wium Lie and Bert Bos, ISBN 0-321-19312-1
  • Cascading Way Sheets Cascading Style Sheets, PhD thesis, by Håkon Wium Lie – provides an authoritative historical reference of CSS
  • Keith Schengili-Roberts (2003): Core CSS, 2nd Edition, Prentice Hall, ISBN 0-13-009278-nine
  • On the Analysis of Cascading Way Sheets, Pierre Geneves, Nabil Layaida, and Vincent Quint, Proceedings of the 21st International Conference on Www (WWW'12), pp. 809–818, 2012.

External links [edit]

  • Official website Edit this at Wikidata
  • CSS at Curlie

dominguezprioughter.blogspot.com

Source: https://en.wikipedia.org/wiki/CSS

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