Worker to update HTML element if it exists or create if it does not
I asked something in #workers-discussions but I think it belongs better here... Is it possible to write a worker that updates an HTML tag e.g. <title> if it's in the page, or inserts it if not? I can do one or the other, but I can't get it working when I need to try both. Have issues with ordering and closures. Maybe I can do some regex first? Any pointers appreciated!
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