The current implementation uses the key property of KeyboardEvent to detect key presses. This approach works well for English keyboards but causes issues on non-English keyboards, such as German keyboards, where the physical keys do not produce the same characters.

For example:

• On English keyboards, Shift + , produces < and Shift + . produces >.
• On German keyboards, these combinations produce ; and : respectively, leading to non-default shortcuts.

Exemplary Solution:

master...MartinNiederl:youtube-custom-speed:master

A more robust solution would be to listen to the physical keys instead:

document.body.addEventListener('keydown', e => {
    if (e.shiftKey && e.code === 'Period') {
        e.preventDefault();
        e.stopPropagation();
        kbshort(true);
    }
    else if (e.shiftKey && e.code === 'Comma') {
        e.preventDefault();
        e.stopPropagation();
        kbshort(false);
    }
}, { capture: true });