Modified: trunk/Source/WebCore/ChangeLog (199868 => 199869)
--- trunk/Source/WebCore/ChangeLog 2016-04-22 05:56:36 UTC (rev 199868)
+++ trunk/Source/WebCore/ChangeLog 2016-04-22 05:56:39 UTC (rev 199869)
@@ -1,3 +1,37 @@
+2016-04-21 Frederic Wang <fw...@igalia.com>
+
+ More improvements and explanations regarding resetting CSS properties on the <math> element
+ https://bugs.webkit.org/show_bug.cgi?id=156840
+
+ Reviewed by Darin Adler.
+
+ We some follow-up improvements regarding CSS rules on the <math> element, after bug 133603:
+ - We fix indenting to use 4 spaces.
+ - We explain why we set -webkit-line-box-contain and add references to related bugs.
+ - We explain why we reset some CSS spacing rules.
+ - We explain why the direction is set to ltr.
+ - We explain why font-family is set to a list of known math fonts and add reference
+ to the wiki.
+ - We mention the need to customize math fonts to get consistent style and add references to
+ a bug report and to the wiki.
+ - We described each of the math font listed and add some justification about their orders.
+ - We better explain the section about fonts that do not satisfy the requirements for good
+ mathematical rendering, reformulate why we still need them for iOS/Mac and we add some
+ references to a bug report and to the wiki. Some fonts that not pre-installed were removed
+ in r199773.
+ - We add a FIXME comments for potential changes of CSS properties on the <math> tag.
+
+ We make the following changes to the lists of font-family:
+ - We move "TeX Gyre Termes Math" into the Times group.
+ - We move "Asana Math" into the Palatino group.
+ - We remove iOS conditionals on "Symbol" and "Times New Roman".
+
+ No new tests, only order of math fonts that are not used by test framework is changed.
+
+ * css/mathml.css:
+ (math): We merge the two math selectors, reorder some font-families, remove iOS ifdef and
+ add more description.
+
2016-04-21 Dean Jackson <d...@apple.com>
Backdrop Filter should not be visible if element has visibility:hidden
Modified: trunk/Source/WebCore/css/mathml.css (199868 => 199869)
--- trunk/Source/WebCore/css/mathml.css 2016-04-22 05:56:36 UTC (rev 199868)
+++ trunk/Source/WebCore/css/mathml.css 2016-04-22 05:56:39 UTC (rev 199869)
@@ -1,46 +1,103 @@
@namespace "http://www.w3.org/1998/Math/MathML";
math {
+ /*
+ We use the exact bounding boxes of glyphs to avoid excessive gaps in mathematical formulas.
+ FIXME: Should we replace this with a more general handling of ink/logical ascent/descent?
+ See http://webkit.org/b/130326, http://webkit.org/b/156841 and
+ http://www.mathml-association.org/MathMLinHTML5/S3.html#SS1.SSS1
+ */
-webkit-line-box-contain: glyphs replaced;
+
+ /*
+ Inheriting the following properties can cause excessive spacing of mathematical formulas so we
+ just reset them to their default values.
+ */
text-indent: 0;
line-height: normal;
word-spacing: normal;
letter-spacing: normal;
+
+ /*
+ In some countries and languages, text is written from right-to-left while mathematical formulas
+ are written from left-to-write. Hence it is wrong to inherit the direction and we reset that
+ property to left-to-write. Per the MathML specification, authors should explicitly use the "dir"
+ attribute on the <math> element if they want to force the overall direction of the mathematical
+ formulas.
+ */
direction: ltr;
+
+ /* Fonts with appropriate Unicode coverage and OpenType features are required for good math
+ rendering. These requirements as well as the up-to-date list of known math fonts to fulfill
+ these requirements are listed on http://trac.webkit.org/wiki/MathML/Fonts.
+ Inheriting the font-family is likely to make MathML use text fonts that are not designed for
+ math layout and thus would cause very poor mathematical rendering. Consequently, the default
+ font-family on the <math> tag is set to a list of recommended math fonts.
+ For best rendering, authors and readers are encouraged to use text and math fonts with consistent
+ style (appearance, size...), see http://trac.webkit.org/wiki/MathML/Fonts#CustomizingMathFont
+ FIXME: Should we make math font properties configurable (http://webkit.org/b/156843)?
+ */
+ font-family:
+ /*
+ This font has Computer Modern style and is provided with most TeX & Linux distributions.
+ We put it as the default because its style is familiar to TeX, Wikipedia and math people.
+ */
+ "Latin Modern Math",
+
+ /*
+ The following fonts have Times style and are provided with most TeX & Linux distributions.
+ We put XITS & STIX as a second option because they have very good unicode coverage.
+ XITS is a fork of STIX with bug fixes and more Arabic/RTL features so we put it first.
+ */
+ "XITS Math",
+ "STIX Math",
+ "Libertinus Math",
+ "TeX Gyre Termes Math",
+
+ /*
+ These fonts respectively have style compatible with Bookman Old and Century Schoolbook.
+ They are provided with most TeX & Linux distributions.
+ */
+ "TeX Gyre Bonum Math",
+ "TeX Gyre Schola",
+
+ /*
+ The following fonts have Palatino style and are provided with most TeX & Linux distributions.
+ Asana Math has some rendering issues (e.g. missing italic correction) so we put it after.
+ */
+ "TeX Gyre Pagella Math",
+ "Asana Math",
+
+ /*
+ The following fonts are proprietary and have not much been tested so we put them at the end.
+ Cambria Math it is pre-installed on Windows 7 and higher.
+ */
+ "Cambria Math",
+ "Lucida Bright Math",
+ "Minion Math",
+
+ /*
+ The following fonts do not satisfy the requirements for good mathematical rendering.
+ These are pre-installed on Mac and iOS so we list them to provide minimal unicode-based
+ mathematical rendering. For more explanation of fallback mechanisms and missing features see
+ http://trac.webkit.org/wiki/MathML/Fonts#ObsoleteFontsandFallbackMechanisms.
+ STIX fonts have best unicode coverage so we put them first. */
+ STIXGeneral,
+ STIXSizeOneSym,
+ Symbol,
+ "Times New Roman",
+
+ /* Mathematical fonts generally use "serif" style. Hence we append the generic "serif" family
+ as a fallback in order to increase our chance to find a mathematical font. */
+ serif;
+
+ /* FIXME: Should we reset more CSS properties (http://webkit.org/b/156839)? */
}
mtext {
line-height: 1.0;
}
-/* Fonts with appropriate Unicode coverage and OpenType features are required for good math rendering.
- Consequently the default font-family on the <math> tag is not inherited but set to a list of known math fonts.
- See http://trac.webkit.org/wiki/MathML/Fonts.
- FIXME: OS X and iOS do not have such fonts pre-installed (bugs 17021145, 16841023 and 16843041 from Apple bug tracker).
- Hence we also append some system fonts to provide minimal Unicode coverage and limited operator stretching.
-*/
math {
- font-family: "Latin Modern Math",
- "XITS Math",
- "STIX Math",
- "Libertinus Math",
- "TeX Gyre Bonum Math",
- "TeX Gyre Pagella Math",
- "TeX Gyre Schola",
- "TeX Gyre Termes Math",
- "Cambria Math",
- "Asana Math",
- "Lucida Bright Math",
- "Minion Math",
- STIXGeneral,
- STIXSizeOneSym,
-#if defined(WTF_PLATFORM_IOS) && WTF_PLATFORM_IOS
- Symbol,
- "Times New Roman",
-#endif
- serif;
-}
-
-math {
display: -webkit-inline-flex !important;
padding-left: 1px;
padding-right: 1px;
