Since I haven’t received a reply from the author, I checked with various sources and received the following response:
The bootstrap-modified.css file embedded in the source code defines a:focus{outline:5px auto -webkit-focus-ring-color;outline-offset:-2px}, which is presumably causing the frame to appear when clicked (this is not specific to Chrome, it’s the same in Edge).
If you are a user and not a site administrator, and this is a major concern, you could try installing a dynamic CSS rewriting extension to override and disable this part.
I’ve found a workaround, but it’s not a fundamental solution.
It seems that setting the following code in the header tracking code improves the display:
I commented out a:focus{outline:5px auto -webkit-focus-ring-color;outline-offset:-2px} in the bootstrap-modified.css file, saved the file, and then uploaded it.
Those using the same theme can try this at their own risk.
What’s the author up to now?
The method of removing a:focus{outline:5px auto -webkit-focus-ring-color;outline-offset:-2px} from the bootstrap-modified.css file worked correctly until yesterday, but the problem reappeared today, so I’m changing my approach.
I’m now using the method of adding the following code to the header tracking code: