The CSS reference

":before" - css pseudo-element (v. css 2)

  • Will add content before an element . The 'content' property, in conjunction with this pseudo-elements, specifies what is inserted.
  • HTML usage: all elements
  • Browsers that support the :before - pseudo-element :
    Internet Explorer Mozilla Firefox Opera Google Chrome Apple Safari
    Browser deviation:
    • To work in IE, a DOCTYPE must be declared.

Pseudo-element ":before" example:

    <title>Page title</title>
    <style type="text/css">
      p.note:before {
        content: "Note:";
        font-weight: bold;
      p#first:after {
        content: " (you cannot use tags in content property)";
        color: red;
    <p id="first"> This is the first paragraph.
    <p class="note"> :after and :before
      plays with CSS content property.
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