[QUESTION] Are *.htm files checked or only *.html ?

[akurtakov]

Thanks for creating this action! We have started to use it to verify and improve Eclipse IDE documentation. In https://github.com/eclipse-platform/eclipse.platform.releng.aggregator/pull/3299#issuecomment-3299433101 we have noted that *.htm files are not being validated. Is this a problem in our config (https://github.com/eclipse-platform/eclipse.platform.releng.aggregator/blob/master/.github/workflows/htmlvalidator.yml ) e.g. missed option or smth like that or it's a limitation of the action?