HTML/CSS/Style Basics/important

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!important rules are used to override specificity

 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
                      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
    <head>
        <title>Specificity, !important</title>
        <style rel="stylesheet" type="text/css">
body {
    font: 14px sans-serif;
}
span#precedence {
    background: lightyellow;
}
span {
    background: orange !important;
}
        
        </style>
    </head>
    <body>
        <p>
            The !important syntax causes a selector to have
            <span id="precedence">
                greater precedence than those without it.
            </span>
        </p>
    </body>
</html>



!important syntax has greater precedence than the (x)HTML style attribute

 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
                      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
    <head>
        <title>Specificity, !important</title>
        <style rel="stylesheet" type="text/css">
body {
    font: 14px sans-serif;
}
span#precedence {
    background: lightyellow;
}
span {
    background: orange !important;
}
        
        </style>
    </head>
    <body>
        <p>
            It also
            <span style="background: lightblue">
                has greater precedence than the (x)HTML style attribute.
            </span>
        </p>
    </body>
</html>
Источник — «http://wbex.ru/index.php?title=HTML/CSS/Style_Basics/important&oldid=5931»