Created attachment 592936 [details] testcase, Lao string on Wikipedia homepage When loading cmaps, we exclude certain scripts that require shaping if the fonts lack GSUB/GPOS or AAT tables. Currently that doesn't include Lao and as a result under OSX 10.6 we use Arial Unicode MS incorrectly for Lao. Based on bug 705594, comment 27, Jonathan feels we should also include Myanmar, Khmer, and N'Ko. Steps: - Open URL on 10.6 with default fonts. Result: ">>>>>>" is displayed. Should instead show hex boxes, since there's no font that supports Lao with the necessary shaping data.