Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
HTML issues tagged as summary.
The <summary> HTML element specifies a clickable summary, caption, or legend for a <details> element’s disclosure box. As the <summary> element has an implicit button role, it’s not needed to include it explicitly.
Here’s an example, clicking the <summary> element toggles the state of the parent <details> element open and closed.
<details> <summary>I have keys but no doors. I have space but no room. You can enter but can’t leave. What am I?</summary> A keyboard. </details>
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