DOMException is thrown for selectors with an explicit empty attribute value

[romansp]

Describe the bug
DOMException: Invalid selector is thrown for an empty attribute value selector, e.g. [contenteditable=""] or [disabled=""].

To Reproduce

// throws DOMException: Invalid selector: "[contenteditable=""], [contenteditable="true"]"

it('Returns all elements matching "[contenteditable=""], [contenteditable="true"]".', () => {
	document.body.innerHTML = `
		<div contenteditable></div>
		<div contenteditable=""></div>
		<div contenteditable="true"></div>
		<div contenteditable="false"></div>
	`;
	const elements = document.querySelectorAll('[contenteditable=""], [contenteditable="true"]');
	expect(elements.length).toBe(3);
	expect(elements[0] === document.body.children[0]).toBe(true);
});

Expected behavior
Selector [contenteditable=""] should be considered correct.

Device:

• Version 9.10.1.

Additional context
This is a regression introduced in v9.10.0.

For reference testing-library/user-event uses this quite complex selector with empty attribute value to find focusable elements on the page: https://github.com/testing-library/user-event/blob/7a305dee9ab833d6f338d567fc2e862b4838b76a/src/utils/focus/selector.ts#L1

[capricorn86]

Thank you for reporting @romansp! 🙂

The issue has been fixed:
https://github.com/capricorn86/happy-dom/releases/tag/v9.10.2