Full Page <iframe>

Question

I have the example code below. This works fine with all browsers except for browsers on mobile devices.

The overflow tag is the issue.

Works with all except

Answer 1

For full-screen frame redirects and similar things I have two methods. Both work fine on mobile and desktop.

Note this are complete cross-browser working, valid HTML files. Just change title and src for your needs.
You may consider dropping if you don't have non-ASCII characters.

1. this is my favorite:

or 2. something like that, slightly shorter:

Note:
To be conservative the above examples avoid using height:100vh because old browsers don't know it (maybe moot these days) and height:100vh is not always equal to height:100% on mobile browsers (probably not applicable here). Otherwise, vh simplifies things a little bit, so

3. this is an example using vh (not my favorite, less compatible with little advantage)