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Tidy: ... attribute "..." has invalid value "..."

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Cause:

Each attribute belongs to a category. And for some types, their values are restricted. Here are the categories of attributes:

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Examples:

<a> attribute "id" has invalid value "567" The attribute ID is of type ID. As described above, it should begin with a letter and have no spaces

Good<a id="567" href="/index.html">
Good<a id="n567" href="/index.html">

<img> attribute "width" has invalid value "740px" HTML width and height attributes do not need "px"; their units are always assumed to be pixels.

Good<img src="example.png" alt="Example" width="740px" height="40px" />
Good<img src="example.png" alt="Example" width="740" height="40" />
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Solution:

To find the type of the attribute, search the tag name (here) and check its definition.

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References:

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