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Inconsistent selectionchange event behavior across browsers when the added input element is not focused #344

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ShuangshuangZhou opened this issue Jan 20, 2025 · 0 comments
Open

Inconsistent selectionchange event behavior across browsers when the added input element is not focused #344

ShuangshuangZhou opened this issue Jan 20, 2025 · 0 comments

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@ShuangshuangZhou
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The selectionchange event behaves inconsistently across browsers when a new <input> element is added to the document.

Specifically, there is a difference between Chrome and Firefox/Safari regarding whether the event is triggered when an <input> element is created and is not focused.

  • Chrome: When going to a page with a <input> element, the selectionchange event is always triggered once, regardless of whether the <input> element is focused or not.

  • Firefox/Safari: The selectionchange event is not triggered unless the newly added element is focused like we manually choose it by the mouse.

see the below simple case (contributed by [email protected] in chromium issue@389368412):

<html>
  <head>
    <script>
      let appendingInput = false;

      const appendInput = () => {
        appendingInput = true;
        const input = document.createElement('input');
        input.value = 'Bug: Adding an input element with a value to the DOM triggers selectionchange';
        document.body.appendChild(input);

        setTimeout(() => {
          appendingInput = false;
        });
      };

      document.addEventListener('selectionchange', (event) => {
        // Only show the message in response to the bug
        if (appendingInput) {
          console.warn('selectionchange while appending input', event);
        }
      });
    </script>
  </head>
  <body>
    <button type="button" onclick="appendInput()">Append input</button>
  </body>
</html>

Do we need to align the expected behavior of this situation?

Thanks!
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@ShuangshuangZhou