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01-Aug-2017 05:30

Over the years we've invented an exorbitant number of tools to circumvent the issues. If you've been using Shadow DOM, chances are you're familiar with the v0 version that shipped in Chrome 35, and the polyfills.For example, when you use a new HTML id/class, there's no telling if it will conflict with an existing name used by the page. Without tools or naming conventions, you can bundle CSS with markup, hide implementation details, and author self-contained components in vanilla Java Script. The concepts are the same, but the v1 spec has important API differences.Shadow DOM removes the brittleness of building web apps.The brittleness comes from the global nature of HTML, CSS, and JS.

See the example in "Custom elements: building reusable web components".If you happen to be interested in the old v0 spec, check out the html5rocks articles: 1, 2, 3. You don't have to create web components that use shadow DOM.There's also a great comparison of the differences between shadow DOM v0 and v1. To feature detect shadow DOM, check for the existence of Until browser support is widely available, the shadydom and shadycss polyfills give you v1 feature. However, authoring custom elements that use Shadow DOM means you can take advantage of features like CSS scoping, DOM encapsulation, and composition.Therefore, it brings solutions for common problems in web development: Although you can use the shadow DOM API and its benefits outside of web components, I'm only going to focus on examples that build on custom elements.

I'll be using the custom elements v1 API in all examples..

All they do is let you toggle the visibility of content by clicking that content's label. Although the interaction is simple, it's an interaction that does not have a consistent native implementation across browsers — despite movement to standardize it.