HTML Checking for Large Sites
Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
HTML issues tagged as aria-expanded.
The aria-expanded attribute can only be true, false, or undefined.
This attribute indicates whether a grouping element is expanded or collapsed.
25,000 HTML checks per month. Fully automated.
Save time using our automated web checker. Let our crawler check your web pages on the W3C Validator.