130326 2014-03-17 03:05:09 -0700 Improve preferred width computation of stretchy operators 2016-07-13 22:35:01 -0700 1 1 1 Unclassified WebKit MathML 528+ (Nightly build) All All NEW P2 Normal --- 121416 130322 1 fred.wang webkit-unassigned mrobinson oldest_to_newest 991162 0 fred.wang 2014-03-17 03:05:09 -0700 This issue has been known for a long time, I'm opening a bug for the record. In general for delimiters (parenthesis, brackets...) the width of size variants and glyph assembly is the same as the base character, so the stretchy operator width does not depend on the stretch height and we can compute the preferred width without knowing the height. Also, for large operators in displaystyle (e.g. sums), we already know which glyph will be picked when we compute the preferred width, so that's not a problem either. However, there are some cases where the glyph width strongly depends on the stretch height that will be used at the end. For example "FRACTION SLASH" in the STIX Math or the large operators when they have the "stretchy" property. Fortunately, these operators are not stretchy by default so the situation does not really happen in practice. However, it would be good to find a solution that does not reintroduce the security issue of bug 121416, perhaps following what Gecko does. See also bug 122837 comment 2, for a related issue which seems specific to STIX fonts. I'll have to check if there are similar issues in MATH fonts. 1149292 1 267370 fred.wang 2015-12-15 08:05:11 -0800 Created attachment 267370 testcase This shows different parenthesis size. The width is slightly different. Actually, only the base size is significantly narrower than the others. 1149345 2 267381 fred.wang 2015-12-15 11:35:23 -0800 Created attachment 267381 testcase 2 1164708 3 271333 fred.wang 2016-02-15 03:05:15 -0800 Created attachment 271333 testcase 3 1164735 4 271340 fred.wang 2016-02-15 06:37:38 -0800 Created attachment 271340 testcase 3 1210871 5 283599 fred.wang 2016-07-13 22:35:01 -0700 Created attachment 283599 Testcase This is a new testcase with better explanation. The logical width computation is now correct in WebKit. However, the preferred width is sometimes overestimated. Gecko behaves the same and I'm not sure there is an easy way to solve this issue, though. 267370 2015-12-15 08:05:11 -0800 2016-07-13 22:35:01 -0700 testcase mo-width.html text/html 1970 fred.wang PCFET0NUWVBFIGh0bWw+CjxodG1sPgogIDxoZWFkPgogICAgPG1ldGEgY2hhcnNldD0idXRmLTgi Lz4KICAgIDx0aXRsZT5idWcgMTMwMzI2PC90aXRsZT4KICAgIDxzdHlsZT4KICAgICAgZm9udC1m YW1pbHk6IExhdGluIE1vZGVybiBNYXRoOwogICAgPC9zdHlsZT4KICA8L2hlYWQ+CiAgPGJvZHk+ CgogICAgPHA+PG1hdGg+PG1yb3c+PG1vPig8L21vPjxtc3BhY2UgaGVpZ2h0PSIuMmVtIiBkZXB0 aD0iLjJlbSIvPjwvbXJvdz48L21hdGg+PC9wPgogICAgPHA+PG1hdGg+PG1yb3c+PG1vPig8L21v Pjxtc3BhY2UgaGVpZ2h0PSIuM2VtIiBkZXB0aD0iLjNlbSIvPjwvbXJvdz48L21hdGg+PC9wPgog ICAgPHA+PG1hdGg+PG1yb3c+PG1vPig8L21vPjxtc3BhY2UgaGVpZ2h0PSIuNGVtIiBkZXB0aD0i LjRlbSIvPjwvbXJvdz48L21hdGg+PC9wPgogICAgPHA+PG1hdGg+PG1yb3c+PG1vPig8L21vPjxt c3BhY2UgaGVpZ2h0PSIuNWVtIiBkZXB0aD0iLjVlbSIvPjwvbXJvdz48L21hdGg+PC9wPgogICAg PHA+PG1hdGg+PG1yb3c+PG1vPig8L21vPjxtc3BhY2UgaGVpZ2h0PSIuNmVtIiBkZXB0aD0iLjZl 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