@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">
.c {
--cache-element-border: 8px solid blue;
}
</style>
</custom-style>
<dom-module id="cache-element">
<template>
<style>
:host {
display: block;
border: var(--cache-element-border, 4px solid orange);
}
</style>
cache-element
</template>
<script>
HTMLImports.whenReady(function() {
Polymer({
is: 'cache-element'
});
});
</script>
</dom-module>
<cache-element id="cache1" class="c"></cache-element>
<cache-element id="cache2"></cache-element>
<script>
suite('custom-style scope cache', function() {
test('elements created declaratively conditionally styled via custom style receive correct properties', function() {
var t1 = document.querySelector('#cache1');
var t2 = document.querySelector('#cache2');
assertComputed(t1, '8px');
assertComputed(t2, '4px');
});
test('elements created imperatively conditionally styled via custom style receive correct properties', function() {
var t1 = document.createElement('cache-element');
t1.classList.add('c');
var t2 = document.createElement('cache-element');
document.body.appendChild(t1);
document.body.appendChild(t2);
assertComputed(t1, '8px');
assertComputed(t2, '4px');
});
});
function assertComputed(element, value, property, pseudo) {
var computed = getComputedStyle(element, pseudo);
property = property || 'border-top-width';
assert.equal(computed[property], value, 'computed style incorrect for ' + property);
}
</script>
</body>
</html>