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Text values in CSS properties


Various CSS data types are expressed using character text, however the meaning and syntax of each type differs.

Text-like CSS data-types include:

In addition, various CSS functions can be used to generate values of these or other data types.


a[href$=".pdf"]::after {
    /* literal string marks links to PDF files */
    content: " (PDF)";
.pulse {
    /* identifier for keyframe animation defined below */
    animation-name: pulse
    animation-duration: 1s;
    /* property values are built-in keywords */
    animation-direction: alternate;
    animation-iteration-count: infinite;
    /* The url() function accepts a string value */
    background-image: url(img/icon.png);

/* "pulse" is referenced above by animation-name property */
@keyframes pulse {
    from { opacity: 1   }
    to   { opacity: 0.5 }

Related specifications

CSS Values and Units Module Level 3
Candidate Recommendation