Doesn't work with nested elements

[panfanky]

I was happy nesting divs this way (container contains one div that contains other elements) works with Firefox and Chrome, but found out it doesn't in Safari.
https://codepen.io/panfanky/pen/dyNLYNJ

Another way - when the container just contains other elements - doesn't seem to work in any browser.
https://codepen.io/panfanky/pen/ZELZbaO