Missed the action at the 2018 Chrome Dev Summit? Catch up with our playlist on the Google Chrome Developers channel on YouTube. Watch now.

Building Components

Components are the building blocks of modern web applications. What best practices should you follow when building your own components so they can stand the test of time?

Custom Elements

Custom elements give developers the ability to extend HTML and create their own tags. Because custom elements are standards based they benefit from the Web's built-in component model. The result is more modular code that can be reused in many different contexts.

Learn more

Shadow DOM

Shadow DOM is a web standard that offers component style and markup encapsulation. It is a critically important piece of the Web Components story as it ensures that a component will work in any environment even if other CSS or JavaScript is at play on the page.

Learn more

Best Practices

Because custom elements and shadow DOM are low-level primitives, it's not always clear how best to combine them to create a component that is robust and works well in many different environments. While you really can do just about anything with these APIs, here are a few best practices to help ensure your components work well anywhere.

Learn more


HowTo-Components are a set of elements which demonstrate Custom Element and Shadow DOM best practices. These elements are not intended to be used in production, but are instead presented as a teaching aide to help map best practice suggestions to actual implementations.

Learn more


Was this page helpful?