User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36

Steps to reproduce:

This issue has been observed while scrolling down to focus one of a SVG elements. Once a SVG element gains focus, html container holding the SVG, scrolls to top creating an awful user experience.

Prerequisites:

1.- Have a SVG inside a HTML container
2.- SVG elements shall be focusable ( tabindex="0" )
3.- HTML container size shall be smaller than SVG

Steps to reproduce ( Scenario 1 ):

1.- Launch a web page on latest version of Firefox ( i.e.: 69.0.3 )
2.- Scroll down to the bottom and press any SVG element ( i.e.: BUTTON2 )

Steps to reproduce ( Scenario 2 ):

1.- Launch a web page on latest version of Firefox ( i.e.: 69.0.3 )
2.- Scroll down to bottom and press any SVG element other than the last one ( i.e.: BUTTON1 ); container will scroll up.
3.- Scroll down until focused element is visible and press "tab" key.

Actual results:

SVG element is focused, but HTML container is scrolling to top losing the original position

Expected results:

SVG element is focused, so HTML container remains in the same position, even when it contains a scrollbar.

Regression window:
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=44edb08719bfeff657a6c2d461bba07bc4345a37&tochange=f33e41f8366b58cc9740e1c71b20f4cdde632398

Regressed by: Bug 778654

Thanks for the bug report. I agree that we shouldn't be scrolling to the position of the inline <svg> element (which is what I think is happening, if I insert a sibling <p> element just before the <svg>).