Function getValueForAttribute

code/new-context-api/public/app.js:3677–3691

* 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)

 * attributes have multiple equivalent values.
 */
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.