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You can use custom CSS properties outside of the context of custom elements, simply as a way to avoid scattering style data throughout a stylesheet. For example:. In the code sample above, the visual theme can be changed by editing the values of the custom properties. This makes it easier to create consistent themes, and your code will be less prone to error. The author of a Polymer element can provide custom CSS properties that you can use to style the appearance of the element in your application. This way, you don't need to know how the element's code works.

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You're viewing an older version of Polymer. Please see Polymer 3. The Polymer library provides a set of features for creating custom elements. These features are designed to make it easier and faster to make custom elements that work like standard DOM elements. Similar to standard DOM elements, Polymer elements can be:. Registration and lifecycle. Registering an element associates a class prototype with a custom element name.

The element provides callbacks to manage its lifecycle. Use behaviors to share code. Declared properties. Declared properties can be configured from markup using attributes.

Declared properties can optionally support change observers, two-way data binding, and reflection to attributes. You can also declare computed properties and read-only properties. Attaching event listeners to the host object and local DOM children. Event retargeting. Behaviors are reusable modules of code that can be mixed into Polymer elements. Experimental features and elements.

Experimental template and styling features. Feature layering. If you're migrating an existing 0. If you're upgrading from the 0. Get set up 2. Add local DOM 3. React to input 5. Base array-selector custom-style dom-bind dom-if dom-repeat dom-template Polymer.

Feature overview Try Polymer Tutorial: Build an element. Similar to standard DOM elements, Polymer elements can be: Instantiated using a constructor or document. Configured using attributes or properties. Populated with internal DOM inside each instance. Responsive to property and attribute changes for example, by populating data into the DOM, or firing an event.

Styled with internal defaults or externally. Responsive to methods that manipulate its internal state. Local DOM. Data binding. Property bindings. Binding to attributes. Utility functions.

Helper methods for common tasks.

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Use custom properties

You're viewing an older version of Polymer. Please see Polymer 3. The Polymer library provides a set of features for creating custom elements. These features are designed to make it easier and faster to make custom elements that work like standard DOM elements.

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