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==== <syntaxhighlight lang="CSS" inline>@supports</syntaxhighlight> ====
A new feature known as feature queries was introduced in CSS3, allowing the detection of specific functionality within the CSS (without requiring the use of a JavaScript library for [[feature detection (web development)|feature detection]]). This new directive can be used to check for the support or lack of support for a specific feature, and checks can be combined with <code>and</code>, <code>or</code>, and <code>not</code>. Obviously, <syntaxhighlight lang="CSS" inline>@supports</syntaxhighlight> rules will only work on browsers that support <syntaxhighlight lang="CSS" inline>@supports</syntaxhighlight>. <syntaxhighlight lang="css">
header {
display: block;
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