colorjs.io/tests/index.js

Color space agnostic color manipulation library

RefTest.hooks.add("reftest-testrow", function (env) {
	let table = this.table;

	if (!table.dataset.colors) {
		return;
	}

	let colorCols = new Set(table.dataset.colors.split(/\s*,\s*/).map(i => i - 1));

	for (let i = 0; i < env.cells.length; i++) {
		if (!colorCols.has(i)) {
			continue;
		}

		let cell = env.cells[i];
		let color = new Color(cell.textContent);
		cell.style.setProperty("--color", color.toString({fallback: true}));
		cell.classList.add(color.luminance > .5 || color.alpha < .5? "light" : "dark");
	}
});