A lot of iOS apps have Chromecast functionality, Safari itself does not. If you want to show people a webpage, where you might have saved a presentation or even videos, you can still do this, using a free app called MomoCast.
How to Cast Webpages That Don’t Have Chromecast Videos
Install MomoCast on your iPhone or iPad – it’s free to use.
Make sure you’re on the same Wi-Fi network as the Chromecast device.
In Safari, tap the Share button, and then tap on Cast with MomoCast.
This will open the webpage you’re on using MomoCast’s browser, which comes with a cast icon on the top right. Tap the name of your Chromecast to connect.
Tap the Cast icon again, and tap on Mirror screen to start streaming. This will display the webpage on your device, which could be used to show a presentation, a PDF file, or even just show friends pictures from your Instagram.
Tap the Cast icon again and tap on Disconnect to end the stream.