Re: [whatwg/fetch] consider adding note that CORS preflight check excludes headers added by the browser or extensions (#1005)

To phrase it differently, I see extensions exhibiting non-standard behavior similar to a user compiling their own browser with non-standard behavior from scratch. In theory extensions can also modify the way scripts execute, HTML parses, URLs are displayed, etc. Where do you draw the line on what non-standard behavior to call out?

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