is attribute has partial support Browser Compatibility Check


Customized built-in elements using the is attribute are not supported by all browsers.

Applicable standards

Change history

  • 5.36 Jan 2020 No longer fires for Edge and Firefox.
  • 5.30 Jul 2018 Added.

This page describes a web site issue detected in HTML documents by SortSite Desktop and OnDemand Suite.

Rule ID: BugHtmlCustomBuiltInElement