Function createStyleNode

test/unit/test-fixed-layer.js:383–389

(attr, value)

  }

  function createStyleNode(attr, value) {
    const node = document.createElement('style');
    if (attr) {
      node.setAttribute(attr, value || '');
    }
    return node;
  }

  function createValidRule(selector, position, elements) {
    const rule = {