Bug 305776 – [GTK][Stable] Constraint Validation errors appear with a blank message

• Component: WebKitGTK
• Status: RESOLVED FIXED

[Douglas Silva]

Created attachment 478068 [details]
Screenshot of GNOME Web showing a blank validation error message

While the validation itself is working, the error message is always blank. See the attached screenshot, please.

I've tested it on "input[type=text]" and "input[type=file]" with the `required` attribute, using the Constraint Validation API only [1] — i.e. "HTMLInputElement.setCustomValidity()".

I can reproduce it on this simple example from MDN: [2]

<form>
  <div class="group">
    <input type="text" />
    <label>Normal</label>
  </div>
  <div class="group">
    <input type="text" required />
    <label>Required</label>
  </div>
  <input type="submit" />
</form>


Debugging information collected from the Epiphany browser (GNOME Web):
- WebKitGTK 2.50.4
- GStreamer 1.26.8
- GTK 4.20.3
- Libadwaita 1.8.3
- Distributor: GNOME


[1] https://developer.mozilla.org/en-US/docs/Learn_web_development/Extensions/Forms/Form_validation#validating_forms_using_javascript
[2] https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes/required#example

[Douglas Silva]

Created attachment 478069 [details]
Screenshot of GNOME Web running on elementary OS, reproducing the bug on the linked MDN page.

[Carlos Garcia Campos]

Created attachment 478075 [details]
Patch for 2.50

This was fixed in main already. This would be the patch for 2.50, since the commit in main shouldn't be backported as is.

[Carlos Garcia Campos]

Created attachment 478076 [details]
Patch for 2.50

[Carlos Garcia Campos]

Fixed in https://github.com/WebKit/WebKit/commit/ebcff6c1ecaa0b639c5cf1198c84128f845212ba