Bug 1108177 - Reftest to check for fallback mark stacking. r=jdaggett
new file mode 100644
--- /dev/null
+++ b/layout/reftests/text/fallback-mark-stacking-1-notref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset=utf-8>
+<style>
+@font-face {
+ font-family: test;
+ /* Note that this font has no OpenType layout tables: */
+ src: url(../fonts/sil/GenR102.ttf);
+}
+body {
+ font-family: test;
+}
+.test {
+ font-size: 100px;
+ line-height: 2;
+}
+</style>
+</head>
+<body>
+These examples should NOT look the same:
+<div class=test>x̃̂ x̂̃</div>
+</body>
new file mode 100644
--- /dev/null
+++ b/layout/reftests/text/fallback-mark-stacking-1.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset=utf-8>
+<style>
+@font-face {
+ font-family: test;
+ /* Note that this font has no OpenType layout tables: */
+ src: url(../fonts/sil/GenR102.ttf);
+}
+body {
+ font-family: test;
+}
+.test {
+ font-size: 100px;
+ line-height: 2;
+}
+</style>
+</head>
+<body>
+These examples should NOT look the same:
+<div class=test>x̂̃ x̃̂</div>
+</body>
--- a/layout/reftests/text/reftest.list
+++ b/layout/reftests/text/reftest.list
@@ -158,16 +158,18 @@ random-if(!winWidget) == arial-bold-lam-
# Fallback (presentation-forms) shaping with a font that lacks GSUB/GPOS
# These tests are not valid with Mac or FT2 font backends because our masking of complex-script ranges
# in the 'cmap' will prevent the test font (without GSUB) being used.
skip-if(B2G) fails-if(cocoaWidget||Android) HTTP(..) == arabic-fallback-1.html arabic-fallback-1-ref.html
fails-if(cocoaWidget||Android||B2G) HTTP(..) == arabic-fallback-2.html arabic-fallback-2-ref.html
fails-if(cocoaWidget||Android||B2G) HTTP(..) == arabic-fallback-3.html arabic-fallback-3-ref.html
fails-if(!cocoaWidget&&!Android&&!B2G) HTTP(..) != arabic-fallback-4.html arabic-fallback-4-notref.html
== arabic-marks-1.html arabic-marks-1-ref.html
+# harfbuzz fallback mark stacking in the absence of GPOS:
+HTTP(..) != fallback-mark-stacking-1.html fallback-mark-stacking-1-notref.html
== 726392-1.html 726392-1-ref.html
== 726392-2.html 726392-2-ref.html
skip-if(B2G) == 726392-3.html 726392-3-ref.html
== 745555-1.html 745555-1-ref.html
== 745555-2.html 745555-2-ref.html
== 820255.html 820255-ref.html
