New answers tagged spellcheck
Not sure if this is a solution, but if you are using FireFox, you can highlight the text, right-click, and use 'View Selection Source', assuming its text present in the HTML of the page. For example, your previous comment looks like this: <span class="comment-copy">There is actually a difference in text editors between breaking and non breaking spaces ...
I don't know of any browsers that will show invisibles, but there are work-arounds. Since you are already "using various online tools for translation and proofreading," I assume you are also copy and pasting between the tools. The easiest solution would to just paste the text into a different text editor as an intermediate step. This should reveal tabs vs. ...
I tried going into System Preferences --> Keyboard --> Text (uncheck) "Correct Spelling Automatically" It seems to have worked (so far) - I still get the option to correct without it automatically correcting (or autocorrecting to a word that was not a real word), at least in my emails, which was my biggest problem.
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