Function getCSSVariableValue

test/browser/style.test.jsx:226–227

()

			const getSpan = () =>
				/** @type {HTMLSpanElement} */ (scratch.firstChild.firstChild);
			const getCSSVariableValue = () =>
				getDiv().style.getPropertyValue('--color');
			const getTextColor = () => window.getComputedStyle(getSpan()).color;

			render(<App color="blue" />, scratch);