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    Note that you can even omit the this. in this case because inline event handlers run with a with(this) (not saying you should) Commented Oct 3, 2019 at 11:05
  • an example in case you are looking for vue.js app. stackoverflow.com/a/79156322/7955629 Commented Nov 4, 2024 at 16:51
  • This is the top-voted answer, but it doesn't work for me (2025-01-29, Firefox 134.0.2, Windows 11). I only see the browser's default message. Commented Jan 29 at 13:12
  • ...when I hover the invalid control, prior to attempting to submit the form. However, the MDN example at developer.mozilla.org/en-US/docs/Learn_web_development/…, which uses the "input" event, fixes that. Commented Jan 30 at 9:53
  • Worked for me. Chrome. Commented Apr 15 at 15:36