Function getValueForAttribute

lib/assets/react-source/development/react.js:4946–4964

* Get the value for a attribute on a node. Only used in DEV for SSR validation. * The third argument is used as a hint of what the expected value is. Some * attributes have multiple equivalent values.

(node, name, expected)

	 */

	function getValueForAttribute(node, name, expected) {
	  {
	    if (!isAttributeNameSafe(name)) {
	      return;
	    }

	    if (!node.hasAttribute(name)) {
	      return expected === undefined ? undefined : null;
	    }

	    var value = node.getAttribute(name);

	    if (value === '' + expected) {
	      return expected;
	    }

	    return value;
	  }
	}
	/**
	 * Sets the value for a property on a node.
	 *