A CSS pseudo-element is a keyword added to a selector that lets you style a specific part of the selected element(s). For example, ::first-line
can be used to change the font of the first line of a paragraph.
/* The first line of every <p> element. */ p::first-line { color: blue; text-transform: uppercase; }
Note: In contrast to pseudo-elements, pseudo-classes
can be used to style an element based on its state.
selector::pseudo-element { property: value; }
You can use only one pseudo-element in a selector. It must appear after the simple selectors in the statement.
Note: As a rule, double colons (::
) should be used instead of a single colon (:
). This distinguishes pseudo-classes from pseudo-elements. However, since this distinction was not present in older versions of the W3C spec, most browsers support both syntaxes for the original pseudo-elements.
Browser | Lowest Version | Support of |
---|---|---|
Internet Explorer | 8.0 | :pseudo-element |
9.0 | :pseudo-element ::pseudo-element | |
Firefox (Gecko) | 1.0 (1.0) | :pseudo-element |
1.0 (1.5) | :pseudo-element ::pseudo-element | |
Opera | 4.0 | :pseudo-element |
7.0 | :pseudo-element ::pseudo-element | |
Safari (WebKit) | 1.0 (85) | :pseudo-element ::pseudo-element |
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https://developer.mozilla.org/en-US/docs/Web/CSS/Pseudo-elements