Pat scroll selector: top

[cornae]

An important use case for pat-scroll is to use it to auto scroll to the top of a content when you come from an overview page at a larger position. Generally the designer wants to scroll to the top most position. In some designs it's hard to find a suitable element to scroll to. A proposed solution is to introduce a special value 'top': selector: top. The value 'top' could be used instead of a CSS selector in case no usable element is available in the design.

I've fitted the test page with an example.

[thet]

Notes:

• selector: top should scroll to position 0/0
• selector should take precedence over href
• Branch with demo page: https://github.com/Patternslib/Patterns/compare/scroll-selector-top
• Prototype ticket: https://github.com/quaive/ploneintranet.prototype/issues/986
• Scrolling demo on https://patternslib.com/scroll has more use cases. Backport those to Patternslib for more complete manual regression testing.