The current version of IsInterstitialDisplayingText has issues handling some escaped HTML content. When I attempted to use it to test the MITM software primary paragraph which includes an escaped HTML <ul></ul> list, it threw an "unexpected character" error.

It would be great if this function could be expanded to work for HTML content as well!

https://cs.chromium.org/chromium/src/chrome/browser/interstitials/security_interstitial_page_test_utils.h?q=isinterstitialdisp&sq=package:chromium&l=26