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HTML Guide

CSS: “font-size”: “px” is not a “font-size” value.

The value passed to the font-size property is invalid, probably missing the amount of px.

The font-size CSS property sets the size of the font, and this size can be expressed in different units, like em, % or px.

Example:

<!DOCTYPE html>
<html>
<head>
    <title>Font-size Example</title>
    <style>
        p {
            font-size: 16px;
        }
    </style>
</head>
<body>
    <p>This is an example of a paragraph with a font-size of 16px.</p>
</body>
</html>

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Related W3C validator issues