There was a link to https://clang.llvm.org/docs/SourceBasedCodeCoverage.html#interpreting-reports

I think we can add a link, or a help button to the toolbar.

Another solution might be to replace a "Created %DATE% %TIME%" text with something useful.

We also might consider not doing that at all, as actually there is a header row in every code coverage report: https://chromium-coverage.appspot.com/reports/557774/linux/chromium/src/third_party/sfntly/src/cpp/src/sample/chromium/font_subsetter.cc.html

which says:

Line | Count | Source