118738 2013-07-16 10:03:11 -0700 Improve how the script size is determined 2024-10-09 00:57:32 -0700 1 1 1 Unclassified WebKit MathML 528+ (Nightly build) All All RESOLVED DUPLICATE 49309 http://www.w3.org/TR/2010/REC-MathML3-20101021/chapter3.html#presm.scriptlevel P2 Normal --- 124907 0 fred.wang webkit-unassigned oldest_to_newest 908933 0 fred.wang 2013-07-16 10:03:11 -0700 Currently the script size is determined by the following CSS rule in WebCore/css/mathml.css: msub > * + *, msup > * + *, msubsup > * + *, munder > * + *, mover > * + *, munderover > * + * { font-size: 0.75em; /* FIXME: MathML standard is 0.71em */ } The MathML specification describes a more complicated way to compute that size using the scriptlevel, scriptminsize and scriptsizemultiplier attributes. In Gecko these are implemented in the text rendering using private -moz-* CSS properties and then these properties are set by the MathML code. Some elements like scripts, fractions or roots increment the scriptlevel (the exact rules rely on the displaystyle value, see bug 118737). See also bucket 3 of the MathML Acid3 tests: http://fred-wang.github.io/AcidTestsMathML/acid3/d http://fred-wang.github.io/AcidTestsMathML/acid3/description.html and chapter 3 of the MathML spec for details: http://www.w3.org/TR/2010/REC-MathML3-20101021/chapter3.html 908948 1 206795 fred.wang 2013-07-16 10:24:56 -0700 Created attachment 206795 testcase Here is a testcase. The scriptsizemultiplier is .5, mroot increments the scriptlevel of its script by 2 and there is no scriptminsize constraint (set to 0). So the size of "SCRIPT" should be 0.5 ^ 2 = 25%, which is the size of "REFERENCE". 2066440 2 fred.wang 2024-10-09 00:57:32 -0700 We should follow MathML Core. marking as duplicate of bug 49309 *** This bug has been marked as a duplicate of bug 49309 *** 206795 2013-07-16 10:24:56 -0700 2013-07-16 10:24:56 -0700 testcase scriptlevel.html text/html 361 fred.wang PCFkb2N0eXBlIGh0bWw+CjxodG1sPgogIDxoZWFkPgogICAgPHRpdGxlPnRlc3RjYXNlPC90aXRs ZT4KICAgIDxtZXRhIGNoYXJzZXQ9InV0Zi04Ii8+CiAgPC9oZWFkPgogIDxib2R5PgoKICAgPG1h dGggc3R5bGU9ImZvbnQtc2l6ZTogODAwJTsiPgogICAgICA8bXRleHQgc3R5bGU9ImZvbnQtc2l6 ZTogMjUlOyI+UkVGRVJFTkNFPC9tdGV4dD4KICAgICAgPG1zdHlsZSBzY3JpcHRzaXplbXVsdGlw bGllcj0iLjUiIHNjcmlwdG1pbnNpemU9IjAiPgoJPG1yb290PgoJICA8bW4+MDwvbW4+CgkgIDxt dGV4dD5TQ1JJUFQ8L210ZXh0PgoJPC9tcm9vdD4KICAgICAgPC9tc3R5bGU+CiAgIDwvbWF0aD4K CiAgPC9ib2R5Pgo8L2h0bWw+Cg==