Warn if there is not an end tag. It doesn't warn if a tag has self-closing solidus and doesn't need the end tag, or the tag is a void element.
Currently, this rule doesn't evaluate whether omit possible the end tag.
❌ Examples of incorrect code for this rule
<span>There is not an end tag.
✅ Examples of correct code for this rule
<span>There is an end tag.</span>