Some websites are Google Cast-enabled to deliver the best possible entertainment experience. Currently, YouTube, Netflix, Movies & TV on Google Play, YouTube Music, and more are Cast-enabled and we're adding new ones all the time!
How will you know if a website is Cast-enabled?
You'll find the Cast button 
on the website within the video or audio player. For sites that aren't Cast-enabled, you can cast the tab to access the content.
on the website within the video or audio player. For sites that aren't Cast-enabled, you can cast the tab to access the content.Benefits of using a Cast-enabled site
On sites that are Cast-enabled, there are numerous benefits to using controls provided by the site instead of just casting the tab for that site.
- Higher quality: Cast-enabled sites can serve high quality content that is best for viewing on TV. This often means you'll get a full 1080p high definition picture and for some content you may also get 5.1 surround sound (if supported by your TV or receiver). When casting a tab, you are limited to a maximum of 720p (if supported by your computer).
- Battery life and computer load: Cast-enabled sites play directly on Google streaming devices and put no load on your computer. Casting a tab requires a lot of your computer's power, which is why it's not supported on all computers.
- Plays independently: When you play from a Cast-enabled site, you can shut down your computer or close the lid. With tab projection, you need to keep your computer on throughout the cast.
Cast-enabled sites will generally try to automatically switch from casting a tab to an optimized mode of operation if you are already casting a tab when you visit the site.
Casting a tab is still very useful for sites that aren't Cast-enabled. However, whenever the Cast button