Created attachment 256259 [details] test case 1. Open the attached test case. 2. Resize the window to be shorter than the height of the page 3. Scroll to the <iframe> at the end of the page. 4. Select any text in the HTML tab of the <iframe> Result: The page scrolls to the top so there is no way for the user to select a range of text from the <iframe>. Notes: 1. The test case is narrowed down from https://css-tricks.com/guide-svg-animations-smil/ 2. https://bugs.webkit.org/show_bug.cgi?id=138089 is similar to this one. But scrolling to top with selection only happens when there is horizontal scrolling.
<rdar://problem/21695796>
*** This bug has been marked as a duplicate of bug 147431 ***