BACK TO TOP appears as soon as the UI scrolls 1px

[blackfalcon]

Is your feature request related to a problem? Please describe.

The code you have displays the BACK TO TOP button as soon as the UI scrolls 1px. Is that desired? Typically you see a button like this appear when the user scrolls part way down the page.

We could set a higher value on line 115 and then set lastKnownScrollPostion to LESS THAN topOfPageYPos.

Or.. we could calculate the total height of the page and then use a percentage of the page to set when the button appears. There is a great example on CSS-Tricks https://css-tricks.com/how-i-put-the-scroll-percentage-in-the-browser-title-bar/

Originally posted by @blackfalcon in #8 (comment)

Describe the solution you'd like

I'd like to review the current assessment of the scrolling feature and understand its decision and discuss why this is different from what is commonly used across the internet.

Exit criteria

Review and discuss options. Create new issues if needed for code/design updates

[blackfalcon]

Meeting with @leeejune and she has agreed to review the demo more closely and make recommendations post that review of this work in progress.

[jason-capsule42]

Per review with @leeejune the scroll position for when to show the button will be changed to 400px.