0, 128)';
		const a = document.getElementById('a');
		const b = document.getElementById('b');
		const c = document.getElementById('c');
		const elements = {
			a,
			b,
			c,
		};

		self.checkElement = async function checkElement(testName, element, shouldBeStyled) {
			const input = elements[element];
			const hasFocus = document.activeElement === input;

			if (!hasFocus && shouldBeStyled) {
				throw new Error(`${testName}: ${element} should have focus to be tested.`);
			}

			const background = getComp