Bug 1574087. Make MathML length, dir, display, displaystyle and mathv…

…ariant case insensitive. r=emilio

See w3c/mathml#22

* mathml/relations/css-styling/attribute-mapping-001.html (length, dir)
* mathml/relations/html5-tree/display-1.html (display)
* mathml/relations/css-styling/displaystyle-1.html (displaystyle)
* mathml/relations/css-styling/displaystyle-2.html (displaystyle)
* mathml/relations/css-styling/mathvariant-case-sensitivity.html (mathvariant)

Note:
* mathml/relations/css-styling/attribute-mapping-002.html also checks
  case insensitiveness of mathvariant and displaystyle but for now we map
  these attributes to internal -moz-* CSS properties.
* mathcolor and mathbackground values are already case insensitive, this
  is verified by mathml/relations/css-styling/attribute-mapping-001.html

Differential Revision: https://phabricator.services.mozilla.com/D42081

UltraBlame original commit: 1dccb45167d39cb443d42afc46fab8ad55426af5

dom/mathml/nsMathMLElement.cpp

@@ -1785,7 +1785,7 @@ if
 (
 unit
 .
-EqualsLiteral
+LowerCaseEqualsLiteral
 (
 "
 em
@@ -1801,7 +1801,7 @@ if
 (
 unit
 .
-EqualsLiteral
+LowerCaseEqualsLiteral
 (
 "
 ex
@@ -1817,7 +1817,7 @@ if
 (
 unit
 .
-EqualsLiteral
+LowerCaseEqualsLiteral
 (
 "
 px
@@ -1833,7 +1833,7 @@ if
 (
 unit
 .
-EqualsLiteral
+LowerCaseEqualsLiteral
 (
 "
 in
@@ -1849,7 +1849,7 @@ if
 (
 unit
 .
-EqualsLiteral
+LowerCaseEqualsLiteral
 (
 "
 cm
@@ -1865,7 +1865,7 @@ if
 (
 unit
 .
-EqualsLiteral
+LowerCaseEqualsLiteral
 (
 "
 mm
@@ -1881,7 +1881,7 @@ if
 (
 unit
 .
-EqualsLiteral
+LowerCaseEqualsLiteral
 (
 "
 pt
@@ -1897,7 +1897,7 @@ if
 (
 unit
 .
-EqualsLiteral
+LowerCaseEqualsLiteral
 (
 "
 pc
@@ -1913,7 +1913,7 @@ if
 (
 unit
 .
-EqualsLiteral
+LowerCaseEqualsLiteral
 (
 "
 q
@@ -3243,7 +3243,7 @@ if
 (
 str
 .
-EqualsASCII
+LowerCaseEqualsASCII
 (
 sizes
 [
@@ -3680,7 +3680,7 @@ if
 (
 str
 .
-EqualsASCII
+LowerCaseEqualsASCII
 (
 dirs
 [

layout/mathml/mathml.css

@@ -114,6 +114,7 @@ display
 "
 block
 "
+i
 ]
 {
 display
@@ -146,6 +147,7 @@ display
 "
 inline
 "
+i
 ]
 {
 display
@@ -169,6 +171,7 @@ displaystyle
 "
 false
 "
+i
 ]
 {
 -
@@ -188,6 +191,7 @@ displaystyle
 "
 true
 "
+i
 ]
 {
 -
@@ -831,6 +835,7 @@ displaystyle
 "
 false
 "
+i
 ]
 {
 -
@@ -850,6 +855,7 @@ displaystyle
 "
 true
 "
+i
 ]
 {
 -
@@ -1060,6 +1066,7 @@ displaystyle
 "
 true
 "
+i
 ]
 {
 -