From a YouTube comment, I tried copying and pasting text into a new Word document, and it looked like this:
Then I selected all the text in Word and changed its font color to black, but then (as expected) it looks like this:
Font > "Text Highlight Color" is already set to "No Color".
Paragraph > "Paragraph Shading" is already set to "No Color".
Paragraph > Borders > "Borders and Shading" > Shading is already set to "No Color".
What other settings exist that cause a background color?
(Where else do I need to set to "No Color" or "Transparent"?)
I'm 99% sure I've learned of the way to solve this before with another less prominent setting, but I just can't remember it.
P.S. I don't want to use the "Clear All Formatting" approach because I want to preserve italics, etc.