mazey-wordpress-utils/src/polyfill.js

WordPress utilities.

/* eslint-disable no-undef */

// querySelector&querySelectorAll polyfill
if (!document.querySelectorAll) {
	document.querySelectorAll = function (selectors) {
		var style = document.createElement('style'), elements = [], element;
		document.documentElement.firstChild.appendChild(style);
		document._qsa = [];

		style.styleSheet.cssText = selectors + '{x-qsa:expression(document._qsa && document._qsa.push(this))}';
		window.scrollBy(0, 0);
		style.parentNode.removeChild(style);

		while (document._qsa.length) {
			element = document._qsa.shift();
			element.style.removeAttribute('x-qsa');
			elements.push(element);
		}
		document._qsa = null;
		return elements;
	};
}

if (!document.querySelector) {
	document.querySelector = function (selectors) {
		var elements = document.querySelectorAll(selectors);
		return (elements.length) ? elements[0] : null;
	};
}