What does this mean?

Heading elements (<h1>, <h2>, ...) must contain some machine-readable text content.

Heading should never be empty, or just contain whitespace:

<h1>   </h1>

Headings which contain images or other media must specify alternative text:

<h1>
    <img src="heading.png" alt="Press releases"> 
</h1>

See Technique H42 for more details.



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