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class BlogStar extends HTMLElement {static get observedAttributes() { return ['counter']; }constructor() {super();this._counter = 0;this.attachShadow({mode: 'open'});}connectedCallback() {if (!this._readied)this.render();}display() {this.output.innerHTML = '★'.repeat(this.counter);}get counter() { return this._counter; }set counter(value) {if (value != this._counter) {this._counter = parseInt(value);this.setAttribute('counter', value);}if (this._readied)this.display();}attributeChangedCallback(attr, oldValue, newValue) {if (oldValue !== newValue) {this[attr] = newValue;}}render() {this._readied = true;var button = document.createElement('star-selector');button.addEventListener('click', this.increment.bind(this));this.shadowRoot.appendChild(button);this.output = document.createElement('span');this.shadowRoot.appendChild(this.output);// Some styles for pretty.this.style.display = 'block';this.style.fontSize = '30px';this.output.style.marginLeft = '10px';}}customElements.define('blog-star', MyHTMLElement);
<br/>:host {<br/>display: block;<br/>font-size: 30px;<br/>}<br/>span {<br/>margin-left: 10px;<br/>}<br/>[[display(counter)]]<br/>class BlogStar extends Polymer.Element {<br/>static get is() { return 'star-selector'; }<br/>static get properties() {<br/>return {<br/>counter: {type: Number, reflectToAttribute: true}<br/>}<br/>}<br/>display(c) {<br/>return '★'.repeat(c);<br/>}<br/>}<br/>customElements.define('blog-star', BlogStar);<br/>
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