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The specified CSS filter is not a standard one, and may only work in some browsers.
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Related W3C validator issues
The <table> element does not accept a height attribute. Use CSS instead.
To query for the size of the viewport (or the page box on page media), the width, height and aspect-ratio media features should be used, rather than device-width, device-height and device-aspect-ratio, which refer to the physical size of the device regardless of how much space is available for the document being laid out. The device-* media features are also sometimes used as a proxy to detect mobile devices. Instead, authors should use media features that better represent the aspect of the device that they are attempting to style against.
The width media feature describes the width of the targeted display area of the output device. For continuous media, this is the width of the viewport including the size of a rendered scroll bar (if any).
In the following example, this media query expresses that the style sheet is only linked if the width of the viewport 768px maximum:
<link rel="stylesheet" media="only screen and (max-width: 768px)" href="styles.css">To query for the size of the viewport (or the page box on page media), the width, height and aspect-ratio media features should be used, rather than device-width, device-height and device-aspect-ratio, which refer to the physical size of the device regardless of how much space is available for the document being laid out. The device-* media features are also sometimes used as a proxy to detect mobile devices. Instead, authors should use media features that better represent the aspect of the device that they are attempting to style against.
The width media feature describes the width of the targeted display area of the output device. For continuous media, this is the width of the viewport including the size of a rendered scroll bar (if any).
In the following example, this media query expresses that the style sheet is only linked if the width of the viewport is greater than 768px:
<link rel="stylesheet" media="only screen and (min-width: 768px)" href="styles.css">A CSS definition for background-image could not be understood by the parser. Check its definition to ensure that it’s well formed and that it contains an appropriate value.
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The value on the display property is not valid.
The display CSS property sets whether an element is treated as a block or inline element and the layout used for its children, such as flow layout, grid or flex.
font-display isn’t a CSS property, it’s a descriptor for use with the @font-face at-rule.
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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-stretch property in CSS defines the relative width of the font, and is used to make the text narrower or wider. The value bold is not a valid value for font-stretch. Instead, you should use the font-weight property to set the boldness of the font.
Here’s an example of how to use the font-weight property to set the text to bold:
<p style="font-weight: bold;">This text is bold.</p>Alternatively, you can use a CSS stylesheet to apply the font-weight property to multiple elements:
<style>
p { font-weight: bold; }
h1 { font-weight: bolder; }
</style>
<p>This text is bold.</p>
<h1>This heading is even bolder.</h1>The CSS font-style property is used to set the style of the font, such as normal, italic, or oblique. The value bold is not a valid value for font-style. Instead, you should use the font-weight property to set the boldness of the font. The valid values for font-weight are normal, bold, bolder, and lighter.
Here’s an example of how to use the font-weight property to set the text to bold:
<p style="font-weight: bold;">This text is bold.</p>Alternatively, you can use a CSS stylesheet to apply the font-weight property to multiple elements:
<style>
p { font-weight: bold; }
h1 { font-weight: bolder; }
</style>
<p>This text is bold.</p>
<h1>This heading is even bolder.</h1>50,000 Accessibility and HTML checks per month. Fully automated.
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