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4edited Jul 28, 2019 at 13:33In Chrome's devtools:
Open the Sources tab
Click the Show Navigator icon if the navigator isn't already showing
Find the name of the frame's HTML file in the navigator tree
Expand it, which will show the domain the frame is from, then expand it again to find frame's HTML file (again)
Click on that file to see its source
Within the script, click in the line number gutter to the right of the line where you want to set a breakpoint
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