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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