Function createValidRule

test/unit/test-fixed-layer.js:391–403

(selector, position, elements)

  }

  function createValidRule(selector, position, elements) {
    const rule = {
      type: 1,
      selectorText: selector,
      style: {position},
      elements,
    };
    if (allRules[selector]) {
      throw new Error('dup selector');
    }
    allRules[selector] = rule;
    return rule;
  }

  function createUnrelatedRule(selector, elements) {
    const rule = {