Why don't animated websites show up on Mac OSX?

Question

HTML

There are a few sites that don't display correctly on a Mac:
siteheart.com/ doesn't display the Login and Register buttons at the top and the robot dialog box.
banner templates are not displayed on the html5maker/templates website (and the layout also slides on the page)
on the toster.ru website, when creating a question, the "Submit" button is not pressed, even when the entire question is formulated and all fields are filled in correctly.
On another Mac, everything is displayed correctly. I tried 3 browsers (IE, Chrome, FF) of the latest versions - it doesn't work the same everywhere.
What can be wrong?

Answer 1

Mac conserves battery power and automatically turns off all flash banners and the like. I did not turn it off, see how to turn off this mode. And the problem will go away.

Answer 2

The first site works fine without flash. Perhaps you have JavaScript disabled?
You can check it like this:
- Safari > Settings > Add-ons > Show "Development" menu....
- Development > Disable JavaScript (should not be checked)