| <!DOCTYPE html> |
| <!-- Inspired by https://github.com/othree/jquery.rtl-scroll-type which is used |
| in various JS frameworks to determine what scroll "type" the engine has |
| when it comes to RTL. When at the initial scroll position (i.e. all the way |
| to the right), some engines sets scrollLeft to 0 and decrement to negative |
| values when scrolling leftwards (Gecko). Others set it to 0 and increment |
| the value when scrolling leftwards (IE / Edge). Others again set it to the |
| width of the scrollable area and decrement it when scrolling leftwards. |
| WebKit / Blink used to be the third case, now they are consistent with Gecko. |
| There are further complications in the latter engine if |
| there's a vertical scrollbar [1], and it's wider than the border box. All |
| we need to worry about here though, is that the script is able to detect |
| that we are "negative". |
| |
| [1] crbug.com/724255 --> |
| <div id="definer" dir="rtl" style="font-size: 14px; width: 1px; height: 1px; position: absolute; top: -1000px; overflow: scroll">A</div> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <script> |
| test(function() { |
| var definer = document.getElementById('definer'); |
| var type = 'reverse'; |
| if (definer.scrollLeft > 0) { |
| type = 'default'; |
| } |
| else { |
| definer.scrollLeft = 1; |
| if (definer.scrollLeft === 0) { |
| type = 'negative'; |
| } |
| } |
| assert_equals(type, 'negative'); |
| }, "Blink should have 'negative' RTL scroll behavior"); |
| </script> |
