HTML Guide for font-size
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>This issue is a false positive by the W3C validator, fixed in the latest versions of Nu Validator.
The value revert is indeed a valid value for the CSS property font-size.
The font-style CSS property sets whether a font should be styled with a normal, italic, or oblique face from its font-family.
Here are examples of valid font-style values:
font-style: normal;
font-style: italic;
font-style: oblique;
font-style: oblique 10deg;
/* Global values */
font-style: inherit;
font-style: initial;
font-style: revert;
font-style: revert-layer;
font-style: unset;A common issue is trying to use font-style to define the size, when font-size should have been used instead, for example:
/* Invalid */
font-style: 1.2em;
/* Valid */
font-size: 1.2em;