"This page contains the following errors:..." when opening a file:/// url ending in .html; page works fine over https with mime type text/html #750
Description
Steps to reproduce
Create a file ~/f.html with the following text (which may violate some standard):
<!doctype html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" style="font-family: Inter, Averta, Helvetica, Arial; font-weight: 400; color: #454745; font-size: 16px;">
</html>
Try to open it as a file://... url. Upload it to a web server (serving it as MIME type text/html) and try to open it via an https://... url.
Expected behaviour
vimb treats the file the same over file://... and https://....
Actual behaviour
vimb has no complaints when accessing it over https://...: a blank page is shown. (I actually had a file with some real content; the content is shown without trouble.) But via file:///... I see a red box with this message:
This page contains the following errors:
error on line 1 at column 2: StartTag: invalid element name
Below is a rendering of the page up to the first error.