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+Monica Dinculescu @notwaldorf BILLIONS SERVED LESSONS LEARNED (A POLYMER STORY)

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@notwaldorf

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THE WEB IS LIKE A SHARK. IT HAS TO CONSTANTLY MOVE FORWARD OR IT DIES WOODY ALLEN

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THE WEB IS LIKE A SHARK. IT HAS TO CONSTANTLY MOVE FORWARD OR IT DIES POLYMER WOODY ALLEN

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POLYMER 1.0 one size fits all

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... Polymer({ is: 'paper-input', behaviors: [...], properties: {...}, listeners: {...}, hostAttributes: {...}, });

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WEB STANDARDS (v0) kind of a mess, tbh

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BASIC USE CASE well lit path!

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ADVANCED USE CASE ???

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DIFFERENT NEEDS leaf vs view nodes

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POLYMER 1.0 one size fits all

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POLYMER 1.0 POLYMER 2.0 one size fits all a la carte

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WEB STANDARDS (v1) are a go!

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YOU USE
 THE PLATFORM WE EMPOWER YOU

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POLYMER 1.0 “do less to be fast”

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POLYMER 1.0 POLYMER 2.0 “do less to be fast” “do more if you need to”

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WE HAVE OPTIONS!

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HTMLElement

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HTMLElement getters/setters

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HTMLElement getters/setters templates

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HTMLElement getters/setters templates {{ }}

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HTMLElement getters/setters templates {{ }}

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HTMLElement PropertyAccessors TemplateStamp PropertyEffects Polymer.Element

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HTMLElement PropertyAccessors TemplateStamp PropertyEffects Polymer.Element 2.2 KB 3.4 KB 8.8 KB 11 KB

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myElement.counter = 3;

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aspiring-chauffeur.glitch.me

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HTMLElement Polymer.PropertyAccessors Polymer.TemplateStamp Polymer.PropertyEffects Polymer.Element 1 2 3 4 5

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class MyElement extends HTMLElement { ... } customElements.define('my-element', MyElement);

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Lifecycle methods! class MyElement extends HTMLElement { constructor() { ... } connectedCallback() { ... } disconnectedCallback() { ... } attributeChangedCallback(attr, oldValue, newValue) { ... } static get observedAttributes() { return [...]; } }

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Lifecycle methods! class MyElement extends HTMLElement { constructor() { ... } connectedCallback() { ... } disconnectedCallback() { ... } attributeChangedCallback(attr, oldValue, newValue) { ... } static get observedAttributes() { return [...]; } }

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Lifecycle methods! class MyElement extends HTMLElement { constructor() { ... } connectedCallback() { ... } disconnectedCallback() { ... } attributeChangedCallback(attr, oldValue, newValue) { ... } static get observedAttributes() { return [...]; } }

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Lifecycle methods! class MyElement extends HTMLElement { constructor() { ... } connectedCallback() { ... } disconnectedCallback() { ... } attributeChangedCallback(attr, oldValue, newValue) { ... } static get observedAttributes() { return [...]; } }

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class MyElement extends HTMLElement { constructor() { super(); this._counter = 0; this.attachShadow({mode: 'open'}); } connectedCallback() { this.render(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); } }

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class MyElement extends HTMLElement { constructor() { super(); this._counter = 0; this.attachShadow({mode: 'open'}); } connectedCallback() { this.render(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); } } Make the shadow root

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class MyElement extends HTMLElement { constructor() { super(); this._counter = 0; this.attachShadow({mode: 'open'}); } connectedCallback() { this.render(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); } } Add things to it

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render() { var button = document.createElement('button'); button.innerHTML = ''; 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'; button.style.background = 'transparent'; button.style.fontSize = 'inherit'; button.style.border = 'none'; button.style.cursor = 'pointer'; }

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render() { var button = document.createElement('button'); button.innerHTML = ''; 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'; button.style.background = 'transparent'; button.style.fontSize = 'inherit'; button.style.border = 'none'; button.style.cursor = 'pointer'; }

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render() { var button = document.createElement('button'); button.innerHTML = ''; 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'; button.style.background = 'transparent'; button.style.fontSize = 'inherit'; button.style.border = 'none'; button.style.cursor = 'pointer'; }

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class MyElement extends HTMLElement { constructor() { super(); this._counter = 0; this.attachShadow({mode: 'open'}); } connectedCallback() { this.render(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); } } Update properties

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class MyElement extends HTMLElement { constructor() { super(); this._counter = 0; this.attachShadow({mode: 'open'}); } connectedCallback() { this.render(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); } } Optional: reflect attribute

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class MyElement extends HTMLElement { constructor() { super(); this._counter = 0; this.attachShadow({mode: 'open'}); } connectedCallback() { this.render(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); } } Actual useful code

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class MyElement extends HTMLElement { constructor() { super(); this._counter = 0; this.attachShadow({mode: 'open'}); } connectedCallback() { this.render(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); } } display() { this.output.innerHTML = ''.repeat(this.counter); } Actual useful code

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ONCE MORE, WITH FEELING LESS BOILERPLATE

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HTMLElement Polymer.PropertyAccessors Polymer.TemplateStamp Polymer.PropertyEffects Polymer.Element 1 2 3 4 5

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class MyElement extends HTMLElement { constructor() { ... } connectedCallback() { this.render(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); } }

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class MyElement extends Polymer.PropertyAccessors(HTMLElement) { constructor() { ... } connectedCallback() { this.render(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); } }

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class MyElement extends Polymer.PropertyAccessors(HTMLElement) { constructor() { ... } connectedCallback() { this.render(); this._enableProperties(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); } } Turn on accessors

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class MyElement extends Polymer.PropertyAccessors(HTMLElement) { constructor() { ... } connectedCallback() { this._enableProperties(); } ready() { this.render(); super.ready(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); } Ready!

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class MyElement extends Polymer.PropertyAccessors(HTMLElement) { constructor() { ... } connectedCallback() { this._enableProperties(); } ready() { this.render(); super.ready(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); }

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class MyElement extends Polymer.PropertyAccessors(HTMLElement) { constructor() { ... } connectedCallback() { this._enableProperties(); } ready() { this.render(); super.ready(); } static get observedAttributes() { return ['counter', 'limit']; } attributeChangedCallback(attr, oldValue, newValue) { if (oldValue !== newValue) { this[attr] = newValue; } } get counter() { return this._counter; } set counter(value) { if (value != this._counter) { this._counter = parseInt(value); this.setAttribute('counter', value); this.display(); }

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class MyElement extends Polymer.PropertyAccessors(HTMLElement) { constructor() { ... } connectedCallback() { this._enableProperties(); } ready() { this.render(); super.ready(); } static get observedAttributes() { return ['counter', 'limit']; } _propertiesChanged(currentProps, changedProps, oldProps) { if ('counter' in changedProps) { // Only reflect this this.setAttribute('counter', changedProps.counter); this.display(); } } } Actual useful code!

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class MyElement extends Polymer.PropertyAccessors(HTMLElement) { constructor() { ... } connectedCallback() { this._enableProperties(); } ready() { this.render(); super.ready(); } static get observedAttributes() { return ['counter', 'limit']; } _propertiesChanged(currentProps, changedProps, oldProps) { if ('counter' in changedProps) // Only reflect this this.setAttribute(‘counter’, changedProps.counter); this.display(); } } } MyHTMLElement.createPropertiesForAttributes(); Do the boilerplate!

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HTMLElement Polymer.PropertyAccessors Polymer.TemplateStamp Polymer.PropertyEffects Polymer.Element 1 2 3 4 5

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CSS/HTML in JS render() { var button = document.createElement('button'); button.innerHTML = ''; button.addEventListener('click', this.increment); this.shadowRoot.appendChild(button); this.output = document.createElement('span'); this.shadowRoot.appendChild(this.output); this.style.display = 'block'; this.style.fontSize = '30px'; this.output.style.marginLeft = '10px'; button.style.background = 'transparent'; button.style.fontSize = 'inherit'; button.style.border = 'none'; button.style.cursor = 'pointer'; }

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render() { var button = document.createElement('button'); button.innerHTML = ''; button.addEventListener('click', this.increment); this.shadowRoot.appendChild(button); this.output = document.createElement('span'); this.shadowRoot.appendChild(this.output); this.style.display = 'block'; this.style.fontSize = '30px'; this.output.style.marginLeft = '10px'; button.style.background = 'transparent'; button.style.fontSize = 'inherit'; button.style.border = 'none'; button.style.cursor = 'pointer'; } CSS/HTML in JS

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CSS/HTML in CSS/HTML render() { var button = document.createElement('button'); button.innerHTML = ''; button.addEventListener('click', this.increment); this.shadowRoot.appendChild(button); this.output = document.createElement('span'); this.shadowRoot.appendChild(this.output); this.style.display = 'block'; this.style.fontSize = '30px'; this.output.style.marginLeft = '10px'; button.style.background = 'transparent'; button.style.fontSize = 'inherit'; button.style.border = 'none'; button.style.cursor = 'pointer'; } :host { display: block; font-size: 30px; } span { margin-left: 10px; } button { background: transparent; font-size: inherit; border: none; cursor: pointer; }

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CSS/HTML in CSS/HTML :host { display: block; font-size: 30px; } span { margin-left: 10px; } button { background: transparent; font-size: inherit; border: none; cursor: pointer; } render() { var button = document.createElement('button'); button.innerHTML = ''; button.addEventListener('click', this.increment); this.shadowRoot.appendChild(button); this.output = document.createElement('span'); this.shadowRoot.appendChild(this.output); this.style.display = 'block'; this.style.fontSize = '30px'; this.output.style.marginLeft = '10px'; button.style.background = 'transparent'; button.style.fontSize = 'inherit'; button.style.border = 'none'; button.style.cursor = 'pointer'; }

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render() { var button = document.createElement('button'); button.innerHTML = ''; button.addEventListener('click', this.increment); this.shadowRoot.appendChild(button); this.output = document.createElement('span'); this.shadowRoot.appendChild(this.output); this.style.display = 'block'; this.style.fontSize = '30px'; this.output.style.marginLeft = '10px'; button.style.background = 'transparent'; button.style.fontSize = 'inherit'; button.style.border = 'none'; button.style.cursor = 'pointer'; } :host { display: block; font-size: 30px; } span { margin-left: 10px; } button { background: transparent; font-size: inherit; border: none; cursor: pointer; } CSS/HTML in CSS/HTML

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:host { display: block; font-size: 30px; } span { margin-left: 10px; } button { background: transparent; font-size: inherit; border: none; cursor: pointer; } Declarative CSS/HTML in CSS/HTML

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:host { display: block; font-size: 30px; } span { margin-left: 10px; } button { background: transparent; font-size: inherit; border: none; cursor: pointer; } this.$.output CSS/HTML in CSS/HTML

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WHICH MEANS EVEN LESS BOILERPLATE!

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class MyHTMLElement extends Polymer.PropertyAccessors(HTMLElement) { constructor() { super(); this._counter = 0; this.attachShadow({mode: 'open'}); } connectedCallback() { this._enableProperties(); } ready() { this.render(); super.ready(); } static get observedAttributes() { return ['counter', 'limit']; } _propertiesChanged(currentProps, changedProps, oldProps) { ... } display() { ... } increment() { ... } render() { ... } } MyHTMLElement.createPropertiesForAttributes();

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class MyHTMLElement extends Polymer.TemplateStamp(Polymer.PropertyAccessors(HTMLElement)) { constructor() { super(); this._counter = 0; this.attachShadow({mode: 'open'}); } connectedCallback() { this._enableProperties(); } ready() { this.render(); super.ready(); } static get observedAttributes() { return ['counter', 'limit']; } _propertiesChanged(currentProps, changedProps, oldProps) { ... } display() { ... } increment() { ... } render() { ... } } MyHTMLElement.createPropertiesForAttributes();

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class MyHTMLElement extends Polymer.TemplateStamp(Polymer.PropertyAccessors(HTMLElement)) { constructor() { super(); this._counter = 0; this.attachShadow({mode: 'open'}); } connectedCallback() { this._enableProperties(); } ready() { this.render(); super.ready(); } static get observedAttributes() { return ['counter', 'limit']; } _propertiesChanged(currentProps, changedProps, oldProps) { ... } display() { ... } increment() { ... } render() { ... } } MyHTMLElement.createPropertiesForAttributes(); No more manual render!

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class MyHTMLElement extends Polymer.TemplateStamp(Polymer.PropertyAccessors(HTMLElement)) { constructor() { super(); this._counter = 0; } connectedCallback() { this._enableProperties(); } ready() { super.ready(); } static get observedAttributes() { return ['counter', 'limit']; } _propertiesChanged(currentProps, changedProps, oldProps) { ... } display() { ... } increment() { ... } } MyHTMLElement.createPropertiesForAttributes();

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class MyHTMLElement extends Polymer.TemplateStamp(Polymer.PropertyAccessors(HTMLElement)) { constructor() { super(); this._counter = 0; } connectedCallback() { this._enableProperties(); } ready() { this.dom = this._stampTemplate(someTemplate); this.attachShadow({mode: 'open'}).appendChild(this.dom); super.ready(); } static get observedAttributes() { return ['counter', 'limit']; } _propertiesChanged(currentProps, changedProps, oldProps) { ... } display() { ... } increment() { ... } } MyHTMLElement.createPropertiesForAttributes(); Stamp the template

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HTMLElement Polymer.PropertyAccessors Polymer.TemplateStamp Polymer.PropertyEffects Polymer.Element 1 2 3 4 5

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class MyHTMLElement extends Polymer.TemplateStamp(Polymer.PropertyAccessors(HTMLElement)) { constructor() { ... } connectedCallback() { ... } ready() { ... } static get observedAttributes() { return ['counter', 'limit']; } _propertiesChanged(currentProps, changedProps, oldProps) { if ('counter' in changedProps) this.setAttribute(‘counter’, changedProps.counter); this.display(); } } display() { ... } increment() { ... } } MyHTMLElement.createPropertiesForAttributes();

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class MyHTMLElement extends Polymer.PropertyEffects(HTMLElement)) { constructor() { ... } connectedCallback() { ... } ready() { ... } static get observedAttributes() { return ['counter', 'limit']; } _propertiesChanged(currentProps, changedProps, oldProps) { if ('counter' in changedProps) this.setAttribute(‘counter’, changedProps.counter); this.display(); } } display() { ... } increment() { ... } } MyHTMLElement.createPropertiesForAttributes();

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class MyHTMLElement extends Polymer.PropertyEffects(HTMLElement)) { constructor() { ... } connectedCallback() { ... } ready() { ... } static get observedAttributes() { return ['counter', 'limit']; } _propertiesChanged(currentProps, changedProps, oldProps) { if ('counter' in changedProps) this.setAttribute(‘counter’, changedProps.counter); this.display(); } } display() { ... } increment() { ... } } MyHTMLElement.createPropertiesForAttributes();

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class MyHTMLElement extends Polymer.PropertyEffects(HTMLElement)) { constructor() { ... } connectedCallback() { ... } ready() { ... } static get observedAttributes() { return ['counter', 'limit']; } display() { ... } increment() { ... } } MyHTMLElement.createPropertiesForAttributes();

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class MyHTMLElement extends Polymer.PropertyEffects(HTMLElement)) { constructor() { ... } connectedCallback() { ... } ready() { ... } static get observedAttributes() { return ['counter', 'limit']; } display() { ... } increment() { ... } } MyHTMLElement.createPropertiesForAttributes(); MyHTMLElement.createReflectedProperty('counter'); Do the boilerplate!

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Data binding! /* ... */ display() { this.$.output.innerHTML = ''.repeat(this.counter); }

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Data binding! /* ... */ [[display(counter)]] display(c) { return ''.repeat(c); }

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HTMLElement Polymer.PropertyAccessors Polymer.TemplateStamp Polymer.PropertyEffects Polymer.Element 1 2 3 4 5

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No content

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class MyHTMLElement extends Polymer.PropertyEffects(HTMLElement)) { constructor() { ... } connectedCallback() { ... } ready() { ... } static get observedAttributes() { return ['counter', 'limit']; } display() { ... } increment() { ... } } MyHTMLElement.createPropertiesForAttributes(); MyHTMLElement.createReflectedProperty('counter');

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class MyHTMLElement extends Polymer.Element { constructor() { ... } connectedCallback() { ... } ready() { ... } static get observedAttributes() { return ['counter', 'limit']; } display() { ... } increment() { ... } } MyHTMLElement.createPropertiesForAttributes(); MyHTMLElement.createReflectedProperty('counter');

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class MyHTMLElement extends Polymer.Element { constructor() { ... } connectedCallback() { ... } ready() { ... } static get observedAttributes() { return ['counter', 'limit']; } display() { ... } increment() { ... } } MyHTMLElement.createPropertiesForAttributes(); MyHTMLElement.createReflectedProperty('counter');

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class MyHTMLElement extends Polymer.Element { static get properties() { return { counter: {type: Number, reflectToAttribute: true, value: 0}, limit: {type: Number} } } display() { ... } increment() { ... } }

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class MyHTMLElement extends Polymer.Element { static get is() { return 'my-element'; } static get properties() { return { counter: {type: Number, reflectToAttribute: true, value: 0}, limit: {type: Number} } } display() { ... } increment() { ... } } Automatic template finding

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Automatic template finding ... class MyHTMLElement extends Polymer.Element { ... } customElements.define(MyHTMLElement.is, MyHTMLElement);

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Automatic template finding ... class MyHTMLElement extends Polymer.Element { ... } customElements.define(MyHTMLElement.is, MyHTMLElement);

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No content

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HTMLElement Polymer.PropertyAccessors Polymer.TemplateStamp Polymer.PropertyEffects Polymer.Element 1 2 3 4 5

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HTMLElement Getters and setters Polymer.TemplateStamp Polymer.PropertyEffects Polymer.Element 1 2 3 4 5

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HTMLElement Getters and setters CSS in JS -> templates Polymer.PropertyEffects Polymer.Element 1 2 3 4 5

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HTMLElement Getters and setters CSS in JS -> templates Data binding Polymer.Element 1 2 3 4 5

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HTMLElement Getters and setters CSS in JS -> templates Data binding Everything + all the convenience 1 2 3 4 5

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POLYMER 2.0 kinda like jQuery for Web Components

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POLYMER 2.0 kinda like jQuery for Web Components. In the sense that it helps you out not that it’s old and boring.

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LIKE…

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ES6 CLASSES: LESS LIBRARY MORE PLATFORM

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class MyHTMLElement extends Polymer.Element { static get is() { return 'my-element'; } static get properties() { return { counter: {type: Number, reflectToAttribute: true, value: 0}, limit: {type: Number} } } display() { ... } increment() { ... } }

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class MyHTMLElement extends Polymer.Element { static get is() { return 'my-element'; } static get properties() { return { counter: {type: Number, reflectToAttribute: true, value: 0}, limit: {type: Number} } } display() { ... } increment() { ... } } Inheritance

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AND SPEAKING OF INHERITANCE…

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Base class ... class MyHTMLElement extends Polymer.Element { static get is() { return 'my-element'; } display() {...} ... } customElements.define(MyHTMLElement.is, MyHTMLElement);

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class MyOtherElement extends MyHTMLElement { static get is() { return 'other-element'; } display(c) { return ''.repeat(c); } } customElements.define(MyOtherElement.is, MyOtherElement); Child class Base Class

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class MyOtherElement extends MyHTMLElement { static get is() { return 'other-element'; } display(c) { return ''.repeat(c); } } customElements.define(MyOtherElement.is, MyOtherElement); Child class Override base class methods

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([[counter]]) class MyOtherElement extends MyHTMLElement { static get is() { return 'other-element'; } static get template() { var t = Polymer.DomModule.import(this.is, 'template'); let superT = MyHTMLElement.cloneNode(true); } customElements.define(MyOtherElement.is, MyOtherElement); Child class Override base class template

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([[counter]]) class MyOtherElement extends MyHTMLElement { static get is() { return 'other-element'; } static get template() { let t = Polymer.DomModule.import(MyOtherElement.is, 'template'); let superT = MyHTMLElement.template.cloneNode(true); return t.content.insertBefore(t.content.firstChild, superT); } } customElements.define(MyOtherElement.is, MyOtherElement); Child class Override base class template

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POLYMER 2.0 HELPS ELEMENTS.

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USE NO SUGAR.

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USE INHERITANCE.

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USE EVERYTHING.

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POLYMER 2.0 HELPS APPS.

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SHADOW STYLING FEELS TOO STRICT?

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Just override! class MyHTMLElement extends Polymer.Element { static get is() { return 'my-element'; } attachDom(dom) { return this.attachShadow({mode:'open'}).appendChild(dom); } }

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Just override! class MyHTMLElement extends Polymer.Element { static get is() { return 'my-element'; } attachDom(dom) { return this.appendChild(dom); } }

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DEFINE ELEMENTS
 IN SCRIPT NOT 
 IMPORTS?

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Just override! class MyHTMLElement extends Polymer.Element { static get is() { return 'my-element'; } static get template() { return ` … [[display(counter)]] ` } }

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WHEN IN DOUBT JUST OVERRIDE.

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WHEN YOU COME TO A FORK IN THE ROAD, TAKE IT. YOGI BERRA

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Come say hi! +Monica Dinculescu @notwaldorf Icons: Gan Khoon Lay from Noun Project