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Feature overview Try Polymer Install Polymer 3.x Tutorial: Build an element

1. Get set up 2. Add shadow DOM 3. Data binding & properties 4. React to input 5. Theming with custom properties

About this release

What's new in 3.0 Upgrade guide Release notes

Custom elements

Custom element concepts Define an element Declare properties Working with legacy elements

Shadow DOM & styling

Shadow DOM concepts DOM templating Style shadow DOM Custom CSS properties

Handle and fire events Gesture events

Data system concepts Work with object and array data Observers and computed properties Data binding Helper elements

Browser support

Overview Polyfills ES6 and modules

Tools overview Polymer CLI CLI commands Create an element project Create an application project Document your elements Test your elements polymer.json specification Node support

Overview App templates Build for production Serve your app The PRPL pattern Service worker

Glossary Global settings

index polymer-element.js Elements

array-selector.js custom-style.js dom-bind.js dom-if.js dom-module.js dom-repeat.js

dir-mixin.js disable-upgrade-mixin.js element-mixin.js gesture-event-listeners.js mutable-data.js properties-changed.js properties-mixin.js property-accessors.js property-effects.js strict-binding-parser.js template-stamp.js

array-splice.js async.js case-map.js debounce.js flattened-nodes-observer.js flush.js gestures.js html-tag.js mixin.js path.js render-status.js resolve-url.js settings.js style-gather.js telemetry.js templatize.js

class.js legacy-data-mixin.js legacy-element-mixin.js mutable-data-behavior.js polymer-fn.js polymer.dom.js templatizer-behavior.js

The Polymer library is in maintenance mode. For new development, we recommend Lit.