Not within the Gmail web client. I would recommend creating a Google Doc, pasting the contents of the message into it and marking it up there.
You could then take the URL of the Doc and put it in a reply to that Gmail thread addressed only to you as a quick way of referencing it in Gmail.
If a group of people are collaborating on this content, using a ...
Not with Gmail all by itself. You can't edit messages once sent/received. At best, you can forward the email message to yourself with the text highlighting you want.
Otherwise, you'll need to look for a third-party solution.
I was facing the same issue, but I have found a solution. I used IFTTT to create a recipe with Todoist and Evernote. Upon installing the Todoist Chrome Extension, I can highlight things, pull up a secondary menu (right-click for most people), and click "Add to Todoist". IFTTT then sends that new item to the end of a note in Evernote, for me to sit down and ...
This was added since Chrome 81 named "Updates to Form Controls and Focus" as an experiment and was applied by default since Chrome 83.
The relevant flag is chrome://flags/#form-controls-refresh (Web Platform Controls updated UI), setting to "Disabled" should at least revert some (if not all) design to the form control and focus.
Google Chrome ...
I created a minimalistic Google Chrome browser extension to disable the text highlights from search results (some people reported that the browser configuration flag doesn't work in some cases).
You can find it here: https://chrome.google.com/webstore/detail/disable-google-search-tex/ompocnnmgiaoieoanemepjflbokldhom
The extension is open source software, if ...
Google Sheets do NOT highlight specific words in text.
Google sheets ONLY show the cells where your search terms are included
After finding the right sheet, use your browser's search feature.
Please pay attention on the counted results.
Google Sheets function ONLY shows found cells (including the search terms)
This is what you see in Google Chrome:
As Dillie-O mentioned, they intentionally prevent text selection. This is annoying for those of us who select text as we're reading.