I have managed to reproduce the issue following the new updates from comment 2. I missed the part that I need to Enter 1 again, and just after that choose suggested value "1234" (auto-fill) So, after submitting the form for the first time and then go again to https://jsfiddle.net/3ubdye4j/ , if just click on the form without entering "1" and choose suggested value "1234" (auto-fill) it works ok, the result is the expected result: "1234", "". If go again to the page after submitting the form for the first time, type 1 and only after that choose suggested value "1234" (auto-fill), the result is: "1234", "Please match the requested format." This is a regression, here is the pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=fbebc15cd4f40f0978bf22def0fcf355ce69f27b&tochange=824bcd08c85e70d98109b04715b26f139e099ce8 @masayuki, can you please take a look over this? Thanks.
Bug 1584963 Comment 3 Edit History
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I have managed to reproduce the issue following the new updates from comment 2. I missed the part that I need to Enter 1 again, and just after that choose suggested value "1234" (auto-fill) So, after submitting the form for the first time and then go again to https://jsfiddle.net/3ubdye4j/ , if just click on the form without entering "1" and choose suggested value "1234" (auto-fill) it works ok, the result is the expected result: "1234", "". If go again to the page after submitting the form for the first time, type 1 and only after that choose suggested value "1234" (auto-fill), the result is: "1234", "Please match the requested format." This is a regression, here is the pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=fbebc15cd4f40f0978bf22def0fcf355ce69f27b&tochange=824bcd08c85e70d98109b04715b26f139e099ce8 @Masayuki, can you please take a look over this? Thanks.