In CSS, ::after creates a pseudo-element that is the last child of the selected element. It is often used to add cosmetic content to an element with the content property. It is inline by default.
/* Add an arrow after links */ a::after { content: "→"; }
Note: The pseudo-elements generated by ::before and ::after are contained by the element's formatting box, and thus don't apply to replaced elements such as <img>, or to <br> elements.
/* CSS3 syntax */ ::after /* CSS2 syntax */ :after
Note: CSS3 introduced the ::after notation (with two colons) to distinguish pseudo-classes from pseudo-elements. Browsers also accept :after, introduced in CSS2.
Let's create two classes: one for boring paragraphs and one for exciting ones. We can then mark each paragraph by adding a pseudo-element to the end of it.
<p class="boring-text">Here is some plain old boring text.</p> <p>Here is some normal text that is neither boring nor exciting.</p> <p class="exciting-text">Contributing to MDN is easy and fun. Just hit the edit button to add new live samples, or improve existing samples.</p>
.exciting-text::after {
content: "<- now this *is* exciting!";
color: green;
}
.boring-text::after {
content: "<- BORING!";
color: red;
} We can style text or images in the content property almost any way we want.
<span class="ribbon">Notice where the orange box is.</span>
.ribbon {
background-color: #5BC8F7;
}
.ribbon::after {
content: "Look at this orange box.";
background-color: #FFBA10;
border-color: black;
border-style: dotted;
} The following example shows the use of the ::after pseudo-element in conjunction with the attr() CSS expression and a data-descr custom data attribute to create a pure-CSS, glossary-like tooltip.
<p>Here is the live example of the above code.<br /> We have some <span data-descr="collection of words and punctuation">text</span> here with a few <span data-descr="small popups which also hide again">tooltips</span>.<br /> Don't be shy, hover over to take a <span data-descr="not to be taken literally">look</span>. </p>
span[data-descr] {
position: relative;
text-decoration: underline;
color: #00F;
cursor: help;
}
span[data-descr]:hover::after {
content: attr(data-descr);
position: absolute;
left: 0;
top: 24px;
min-width: 200px;
border: 1px #aaaaaa solid;
border-radius: 10px;
background-color: #ffffcc;
padding: 12px;
color: #000000;
font-size: 14px;
z-index: 1;
} | Specification | Status | Comment |
|---|---|---|
| CSS Pseudo-Elements Level 4 The definition of '::after' in that specification. | Working Draft | No significant changes to the previous specification. |
| CSS Transitions The definition of 'transitions on pseudo-element properties' in that specification. | Working Draft | Allows transitions on properties defined on pseudo-elements. |
| CSS Animations The definition of 'animations on pseudo-element properties' in that specification. | Working Draft | Allows animations on properties defined on pseudo-elements. |
| Selectors Level 3 The definition of '::after' in that specification. | Recommendation | Introduces the two-colon syntax. |
| CSS Level 2 (Revision 1) The definition of '::after' in that specification. | Recommendation | Initial definition, using the one-colon syntax |
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support |
Yes Yes1 |
Yes Yes1 |
11 |
9 81 |
7 41 |
4 41 |
| Animation and transition support | 26 | Yes | 4 | No | No | No |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support |
Yes Yes1 |
? |
Yes Yes1 |
? | ? | ? | ? |
| Animation and transition support | Yes | ? | Yes | 4 | No | No | ? |
1. Supported as :after.
2. Before Firefox 57, Firefox had a bug where ::after pseudo-elements were still generated, even if the content property value were set to normal or none.
3. Before Firefox 3.5, only the CSS level 2 behavior of :after was supported, which disallowed position, float, list-style-* and some display properties.
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https://developer.mozilla.org/en-US/docs/Web/CSS/::after