Safari 12.1 support issues

[ludoboludo]

Describe the current behavior

Some of the things we're using aren't supported in Safari 12.1:

• ResizeObserver, used for the sliders.
• IntersectionObserver, used for the product recos and the header (specifically Safari on iOS)

Which breaks some functionalities:

• local selector in the footer (not opening),
• product modal (not opening),
• cart notification (not showing up)

Describe the expected behavior

Ideally all those features mentioned above would work as expected.

Version information (Dawn, browsers and operating systems)

• Dawn Version: 1.0.0
• macOS Version 10.14
• Safari version 12.1

Possible solution

When removing mentions of the ResizeObserver and IntersectionObserver it seem to work as expected. But we didn't look into how to replace what they're doing with a fallback.

Additional context/screenshots

[ludoboludo]

Good point from @michaelburtonray reminding me: According to Theme requirements Only the latest two major releases of a browser need support (Safari 14 and Safari 13)