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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11The CSS content property controls what appears in generated-content contexts, most often text added with ::before or ::after. It can also affect how certain elements are rendered. Use it for brief, presentation-linked additions—not for information readers need to understand the page.
What does the CSS content property do?
content supplies the material rendered by a pseudo-element or, in specific cases, changes an element’s replacement rendering. Its everyday use is to add a short string before or after an element. The generated material is created by CSS; it does not become a node in the document’s DOM. See the MDN content property reference.
How do you add text before or after an element?
Write a rule for the element’s ::before or ::after pseudo-element and set content to a quoted string:
.notice::before {
content: "Note: ";
font-weight: 700;
}This displays “Note:” before the notice’s existing content. ::after works the same way at the end. The pseudo-element must have a non-normal content value to generate content. This pattern is useful for a supplementary label or punctuation that is closely tied to presentation. If the label conveys essential status or meaning, put it in the HTML too. MDN’s guide to using CSS generated content covers this pattern.
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What kinds of content can CSS generate?
The value can be more than plain text. Common categories include strings, images, counters, and quote marks. The broader standards treatment appears in the W3C CSS Generated Content Module Level 3 and the older CSS 2.2 generated-content chapter.
Strings and symbols
A quoted string can add a short textual or symbolic flourish, such as a decorative separator. Keep additions short and avoid using them as a substitute for page copy.
Images
The content value can include an image. Because an image generated this way is presentation-layer material rather than an ordinary HTML image element, do not rely on it to convey information that requires meaningful alternative text or must remain available independently of CSS.
Counters and list markers
Generated content can display counter values, which is useful for automatically numbered or nested items. For a list marker specifically, ::marker is the pseudo-element to style or customize; it is distinct from adding text with ::before.
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Quotation marks
CSS can insert quotation marks with the open-quote and close-quote keywords. The quotes property sets the pairs used, including language-sensitive quote behavior. These features are described in the W3C generated-content specifications linked above.
Is CSS-generated content accessible?
Sometimes assistive technologies expose generated content, but behavior varies across browser and assistive-technology combinations. MDN notes that generated content is not part of the DOM and may not be announced in some combinations. Accordingly, do not put indispensable instructions, warnings, names, or labels solely in a content declaration. Keep substantive meaning in the HTML, where it can also remain available when stylesheets fail or are disabled.
The W3C Level 3 specification says, “Generated content should be searchable, selectable, and available to assistive technologies.” That is specification intent, not a guarantee of consistent implementation in every current environment. For practical authoring, use CSS-generated text as an enhancement and verify behavior in the browser and assistive technology relevant to your audience.
What about translation and CSS being unavailable?
Text embedded in stylesheets can complicate localization: a label may need different wording or grammar in another language, requiring language-specific styling or stylesheets. If the text is substantive or needs translation, put it in the document and let the site’s normal localization process handle it. CSS-generated additions also disappear if the relevant stylesheet is not applied, so they should not carry meaning required to use the page.
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How widely is the content property supported?
MDN labels the property Baseline and widely available, with broad browser availability since July 2015. That describes the property’s common use; MDN cautions that support for some parts varies. Its generated-content guide also notes that some proposed properties and functions in the Level 3 module are not implemented. Do not assume that every feature described in a specification is available in browsers. Check compatibility for a less common value or feature before depending on it.
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