<bar>- it is a tag with a random name, not officially recognized, so it makes sense that it is considered invalid
<div> is valid because it is a standard HTML element - does Angular have a documented list of standard elements? Where can I find information about the validity of this element?
Absolutely right. The comprehensive list includes not just HTML tags, but also HTML5 tags. Any unfamiliar tags will be treated as component tags, but you have the option to bypass this validation by incorporating CUSTOM_ELEMENT_SCHEMA in the ngModule decorator under the schemas field.
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