<html> <head> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> (oops, sent the original from the wrong email address so it probably didn't go through to the mailing list) <div class="moz-cite-prefix">On 2/8/15 12:32, Jonathan Kew wrote: </div> <blockquote cite="mid:55BDFFE3.1080007@mozilla.com" type="cite"> <meta http-equiv="content-type" content="text/html; charset=utf-8"> Hey Behdad, In <a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://bugzilla.mozilla.org/show_bug.cgi?id=729993">https://bugzilla.mozilla.org/show_bug.cgi?id=729993</a>, we'd like to switch Gecko to use <meta http-equiv="content-type" content="text/html; charset=utf-8"> HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS, so as to enable independent mark coloring. However, it turns out this breaks other aspects of rendering behavior; in particular, we get test failures in a couple of tests using variation selectors. Looking at the code, I believe this is because _hb_ot_shape_normalize relies on the .cluster field to identify the ranges within which it operates. We'll need to fix this to use unicode properties instead, or something like that. Similarly, we get a failure in a test for fallback mark positioning, because _hb_ot_shape_fallback_position also relies on .cluster. For these operations, we need to work on a consistent "cluster" regardless of the setting of the HB_BUFFER_CLUSTER_LEVEL option. JK </blockquote> Just following up on this, see <a class="moz-txt-link-freetext" href="https://hg.mozilla.org/try/rev/b01499276dc2">https://hg.mozilla.org/try/rev/b01499276dc2</a> for a patch I tried that fixes the test failures in Firefox. JK </body> </html>