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script: Support keyCode, charCode in KeyboardEvent constructor (#39590)

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Support `keyCode` and `charCode` fields in KeyboardEventInit for
Speedometer 3.0

Speedometer 3.0 fails because Servo's KeyboardEvent constructor ignores 
keyCode and charCode parameters, hardcoding them to 0. This breaks
frameworks
that check `event.keyCode === 13` for Enter key detection.  This is how
[Speedometer 3.0 dispatches key
events](8d67f28d02/resources/benchmark-runner.mjs (L166))
vs [Speedometer 2.0
triggerEnter](491acc2d64/resources/tests.mjs (L60)).

Speedometer 3.0 uses the modern KeyboardEvent constructor but passes 
[legacy fields like keyCode and
charCode](https://w3c.github.io/uievents/#legacy-dictionary-KeyboardEventInit)
in the init dictionary for backwards
compatibility with older frameworks(for example: backbone.js)

This change uncomments the legacy KeyboardEventInit fields and updates 
the constructor to read them from the init dictionary instead of 
hardcoding to 0.

Testing: No new tests added. 
Fixes: part of https://github.com/servo/servo/issues/16719

Servo running Speedometer3.0 successfully
<img width="1136" height="880" alt="speedometer 3 0"
src="https://github.com/user-attachments/assets/cf5199a5-d88d-4495-ae96-05fa6332b97e"
/>

---------

Signed-off-by: atbrakhi <atbrakhi@igalia.com>
This commit is contained in:
atbrakhi 2025-10-01 16:45:33 +02:00 • committed by GitHub
parent e49fcdeffd
commit 4ea363277e
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4 changed files with 40 additions and 4 deletions
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4
components/script/dom/keyboardevent.rs
View file

@ -186,8 +186,8 @@ impl KeyboardEventMethods<crate::DomTypeHolder> for KeyboardEvent {
init.repeat,
init.isComposing,
modifiers,
0,
0,
init.charCode,
init.keyCode,
can_gc,
);
*event.key.borrow_mut() = init.key.clone();

4
components/script_bindings/webidls/KeyboardEvent.webidl
View file

@ -53,8 +53,8 @@ dictionary KeyboardEventInit : EventModifierInit {
};
// https://w3c.github.io/uievents/#legacy-dictionary-KeyboardEventInit
/*partial dictionary KeyboardEventInit {
partial dictionary KeyboardEventInit {
unsigned long charCode = 0;
unsigned long keyCode = 0;
unsigned long which = 0;
};*/
};