When html file is opened with the default html major mode mhtml-mode the
minibuffer will show this error message:

    Eval error in the ‘c-lang-defvar’ or ‘c-lang-setvar’ for
    ‘font-lock-comment-end-skip’ (fallback source eval - js-mode compiled
    with CC Mode 5.34 but loaded with 5.34.1): (error
    "‘c-font-lock-comment-end-skip’ got no (prior) value in js-mode (might
    be a cyclic reference)") [2 times] mhtml-mode

I think this can be seen with any html file but I have attached a simple
"test.html" for testing.

    emacs -Q test.html