Unknown tag

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

HtmlUnknownTag

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | HTML

Here you can find the description of settings available for the Unknown tag inspection, and the reference of their default values.

Custom HTML tags

Default: Selected