@polymer/polymer
Version:
The Polymer library makes it easy to create your own web components. Give your element some markup and properties, and then use it on a site. Polymer provides features like dynamic templates and data binding to reduce the amount of boilerplate you need to
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HTML
<!--
@license
Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->
<html>
<head>
<meta charset="utf-8">
<script src="../../../webcomponentsjs/webcomponents-lite.js"></script>
<script src="../../../web-component-tester/browser.js"></script>
<link rel="import" href="../../polymer.html">
</head>
<body>
<custom-style>
<style is="custom-style">
html {
--mixin: {
border: 2px solid rgb(255, 0, 0);
};
}
</style>
</custom-style>
<custom-style>
<style is="custom-style">
#target {
@apply --mixin;
}
</style>
</custom-style>
<div id="target"></div>
<dom-if><template></template></dom-if>
<dom-repeat><template></template></dom-repeat>
<script>
addEventListener('WebComponentsReady', () => {
class XFoo extends Polymer.Element {
connectedCallback() {
this.spy = sinon.spy(window.ShadyCSS, 'styleElement');
super.connectedCallback();
this.spy.restore();
}
}
customElements.define('x-foo', XFoo);
});
</script>
<script>
suite('styling-only-template', function () {
function assertComputed(element, value, pseudo) {
var computed = getComputedStyle(element, pseudo);
assert.equal(computed['border-top-width'], value, 'computed style incorrect');
}
test('elements without templates do not call ShadyCSS', () => {
let el = document.createElement('x-foo');
document.body.appendChild(el);
assert.ok(el.spy);
assert.isTrue(el.spy.notCalled);
});
test('dom-repeat and dom-if do not break custom-style', () => {
// force custom-style flushing
let target = document.querySelector('#target');
window.ShadyCSS.styleDocument();
assertComputed(target, '2px');
});
});
</script>
</body>