Consider the error message:
I am surprised that Google decided to have it this way because I assume that people wouldn't rather be eager to read nine lines of text with no typography (nothing emphasised etc.).
Wouldn't it be better to use an itemized list here like the following one?
- We tried to visit paypal.com, but thanks to HSTS we detected a possible network attack,
- Please check if a WiFi login screen interrupted the connection, try visiting an unencrypted website,
- Your data is still safe, but you cannot continue. Network errors and attacks are usually temporary, try again later.
I also thought of a bullet list describing the problem in two headings: "what happened?" and "what can I do?".
Would this be any better? What's the rule of thumb on how much text can be put in an error message?