Oh good. I mean you're dealing with a repeat submission issue your way, and that's great—that's the actual problem I want to help readers solve—but maybe do consider accessibility.
e.g. What happens if I use 'enter' to submit the form (which I find really awkward anyway) or 'space' if I'm focused on the button. I probably still have focus and could submit again.
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Oh good. I mean you're dealing with a repeat submission issue your way, and that's great—that's the actual problem I want to help readers solve—but maybe do consider accessibility.
e.g. What happens if I use 'enter' to submit the form (which I find really awkward anyway) or 'space' if I'm focused on the button. I probably still have focus and could submit again.