HTML Checking for Large Sites
Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
HTML issues tagged as h1.
The HTML <h1> to <h6> elements represent headings for the different sections of a document, where <h1> is the highest section and <h6> is the lowest. Headings are specially important on screen readers as they give a quick overview of the contents of the different sections in the web page, so although it’s technically correct (not an error) to use a <h1> in this way:
<section class="about">
<article>
<h1>Article heading</h1>
<p>Lorem</p>
</article>
</section>
this will raise a warning as it would be preferrable for example to leave the <h1> for the heading of the <section>, and <h2> for the heading of the article, like this:
<section class="about">
<h1>About heading</h1>
<article>
<h2>Article heading</h2>
<p>Lorem</p>
</article>
</section>
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