HTML Checking for Large Sites
Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
CSS properties need to be separated by semicolons. Check for the missing semicolon between properties.
In the example below, a forgotten semicolon before the content property makes the CSS parser unable to understand the properties:
<style>
nice {
z-index: auto
content: "";
display: block;
}
</style>Fix it by including the forgotten semicolon like this:
<style>
nice {
z-index: auto;
content: "";
display: block;
}
</style>Related W3C validator issues
The <table> element does not accept a height attribute. Use CSS instead.
Character references must always start with an ampersand (&) and end with a semicolon (;), for example the < character can be referenced as <.
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.
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.
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The specified CSS filter is not a standard one, and may only work in some browsers.
font-display isn’t a CSS property, it’s a descriptor for use with the @font-face at-rule.
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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 @import CSS rule can be used to import a style sheet into another style sheet. It must appear at the top of the document, and after any @charset declaration.
The max-width CSS property sets the maximum width of an element. It prevents the used value of the width property from becoming larger than the value specified by max-width.
This property can express a value in different units like px, em, % or ch, and keyword values, but auto is not an allowed value.
Some examples of valid values for max-width:
/* <length> value */
max-width: 3.5em;
/* <percentage> value */
max-width: 75%;
/* Keyword values */
max-width: none;
max-width: max-content;
max-width: min-content;
max-width: fit-content(20em);
/* Global values */
max-width: inherit;
max-width: initial;
max-width: revert;
max-width: unset;The value specified for the min-height CSS attribute is not valid.
Still checking your large sites one page at a time?
Save time using our automated web checker. Let our crawler check your web pages on the W3C Validator.