Webcomponents.js (v1 spec polyfills) Note. For polyfills that work with the older Custom Elements and Shadow DOM v0 specs, see the. For polyfills that include HTML Imports, see the. A suite of polyfills supporting the specs: • Custom Elements v1: allows authors to define their own custom tags (,, ). • Shadow DOM v1: provides encapsulation by hiding DOM subtrees under shadow roots (,,, ). For browsers that need it, there are also some minor polyfills included: • • • Event, CustomEvent, MouseEvent constructors and Object.assign, Array.from (see ) • How to use Install polyfills.

Npm install @webcomponents/webcomponentsjs You can also load the code from a CDN such as unpkg: Using webcomponents-bundle.js The webcomponents-bundle.js contains all of the web components polyfills and is suitable for use on any supported browser. All of the polyfill code will be loaded but each polyfill will only be used based on feature detection.

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The bundle includes Custom Elements, Shady DOM/CSS and generic platform polyfills (such as ES6 Promise, Constructable events, etc.) (needed by Internet Explorer 11), and Template (needed by IE 11 and Edge). The webcomponents-bundle.js is very simple to use but it does load code that is not needed on most modern browsers, slowing page load. For best performance, use the webcomponents-loader.js. Here's an example. Using webcomponents-loader.js The webcomponents-loader.js is a client-side loader that dynamically loads the minimum polyfill bundle, using feature detection. Webcomponents-loader.js can be loaded synchronously, or asynchronously depending on your needs. Inlining If you have inlined the source of webcomponent-loader.js, then you should specify window.WebComponents.root as the root from which to load the polyfills.

Download film thailand buppah rahtree sub indo. Asynchronous When loaded asychronously with the defer attribute, polyfill bundles will be loaded asynchronously, which means that scripts and modules that depend on webcomponents APIs must be loaded using WebComponents.waitFor function. The WebComponents.waitFor function takes a callback function as an argument, and will evaluate that callback after the polyfill bundle has been loaded. The callback function should load scripts that need the polyfills (typically via import('my-script.js')) and should return a promise that resolves when all scripts have loaded.