15 files changed, 30 insertions, 22 deletions
diff --git a/image/test/crashtests/delaytest.html b/image/test/crashtests/delaytest.html
index 00cd1ebd1..762aec789 100644
--- a/image/test/crashtests/delaytest.html
+++ b/image/test/crashtests/delaytest.html
@@ -4,7 +4,8 @@
 <title>Delayed image reftest wrapper</title>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
 // This loads a externally specified image, forces a draw (in case of
 // decode-on-draw), waits 350ms, and then triggers the reftest snapshot.
diff --git a/image/test/mochitest/green-background.html b/image/test/mochitest/green-background.html
index afc3c206e..6b4518e73 100644
--- a/image/test/mochitest/green-background.html
+++ b/image/test/mochitest/green-background.html
@@ -9,7 +9,8 @@ img {
 </style>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
 // Loads an externally specified image and displays it
 // with a green background. Intended for use with tests
diff --git a/image/test/reftest/apng/delaytest.html b/image/test/reftest/apng/delaytest.html
index af3937a57..4a0b935d9 100644
--- a/image/test/reftest/apng/delaytest.html
+++ b/image/test/reftest/apng/delaytest.html
@@ -4,7 +4,8 @@
 <title>Delayed image reftest wrapper</title>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
 // This loads a externally specified image, forces a draw (in case of
 // decode-on-draw), waits 100ms, and then triggers the reftest snapshot.
diff --git a/image/test/reftest/bmp/bmp-corrupted/wrapper.html b/image/test/reftest/bmp/bmp-corrupted/wrapper.html
index 47e68959f..22b74c8fc 100644
--- a/image/test/reftest/bmp/bmp-corrupted/wrapper.html
+++ b/image/test/reftest/bmp/bmp-corrupted/wrapper.html
@@ -14,13 +14,13 @@
 </script>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
   // Use as "wrapper.html?image.png"
   var imgURL = document.location.search.substr(1);
   document.images[0].onload = onImageLoad;
   document.images[0].onerror = onImageLoad;
-  document.images[0].alt = "";
   document.images[0].src = imgURL;
 </script>
 </body>
diff --git a/image/test/reftest/bmp/bmpsuite/b/wrapper.html b/image/test/reftest/bmp/bmpsuite/b/wrapper.html
index 47e68959f..22b74c8fc 100644
--- a/image/test/reftest/bmp/bmpsuite/b/wrapper.html
+++ b/image/test/reftest/bmp/bmpsuite/b/wrapper.html
@@ -14,13 +14,13 @@
 </script>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
   // Use as "wrapper.html?image.png"
   var imgURL = document.location.search.substr(1);
   document.images[0].onload = onImageLoad;
   document.images[0].onerror = onImageLoad;
-  document.images[0].alt = "";
   document.images[0].src = imgURL;
 </script>
 </body>
diff --git a/image/test/reftest/bmp/bmpsuite/q/wrapper.html b/image/test/reftest/bmp/bmpsuite/q/wrapper.html
index 47e68959f..22b74c8fc 100644
--- a/image/test/reftest/bmp/bmpsuite/q/wrapper.html
+++ b/image/test/reftest/bmp/bmpsuite/q/wrapper.html
@@ -14,13 +14,13 @@
 </script>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
   // Use as "wrapper.html?image.png"
   var imgURL = document.location.search.substr(1);
   document.images[0].onload = onImageLoad;
   document.images[0].onerror = onImageLoad;
-  document.images[0].alt = "";
   document.images[0].src = imgURL;
 </script>
 </body>
diff --git a/image/test/reftest/downscaling/downscale-16px.html b/image/test/reftest/downscaling/downscale-16px.html
index b34adb93d..06d6db2bf 100644
--- a/image/test/reftest/downscaling/downscale-16px.html
+++ b/image/test/reftest/downscaling/downscale-16px.html
@@ -14,13 +14,13 @@
 </script>
 </head>
 <body>
-<img width="16px" height="16px" id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img width="16px" height="16px" id="image1" alt=" ">
 <script>
   // Use as "wrapper.html?image.png"
   var imgURL = document.location.search.substr(1);
   document.images[0].onload = onImageLoad;
   document.images[0].onerror = onImageLoad;
-  document.images[0].alt = "";
   document.images[0].src = imgURL;
 </script>
 </body>
diff --git a/image/test/reftest/downscaling/downscale-8px.html b/image/test/reftest/downscaling/downscale-8px.html
index 32cb1b211..fdc632e53 100644
--- a/image/test/reftest/downscaling/downscale-8px.html
+++ b/image/test/reftest/downscaling/downscale-8px.html
@@ -14,7 +14,8 @@
 </script>
 </head>
 <body>
-<img width="8px" id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img width="8px" id="image1" alt=" ">
 <script>
   // Use as "wrapper.html?image.png"
   var imgURL = document.location.search.substr(1);
diff --git a/image/test/reftest/gif/delaytest.html b/image/test/reftest/gif/delaytest.html
index 58fb080f9..a6fc80f3e 100644
--- a/image/test/reftest/gif/delaytest.html
+++ b/image/test/reftest/gif/delaytest.html
@@ -4,7 +4,8 @@
 <title>Delayed image reftest wrapper</title>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
 // This loads a externally specified image, forces a draw (in case of
 // decode-on-draw), waits 100ms, and then triggers the reftest snapshot.
diff --git a/image/test/reftest/ico/cur/wrapper.html b/image/test/reftest/ico/cur/wrapper.html
index 5bbe75e01..45b516775 100644
--- a/image/test/reftest/ico/cur/wrapper.html
+++ b/image/test/reftest/ico/cur/wrapper.html
@@ -14,7 +14,8 @@
 </script>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
   // Use as "wrapper.html?image.png
   var imgURL = document.location.search.substr(1);
diff --git a/image/test/reftest/ico/ico-bmp-corrupted/wrapper.html b/image/test/reftest/ico/ico-bmp-corrupted/wrapper.html
index 5935f3763..56c1f79b3 100644
--- a/image/test/reftest/ico/ico-bmp-corrupted/wrapper.html
+++ b/image/test/reftest/ico/ico-bmp-corrupted/wrapper.html
@@ -51,7 +51,6 @@
     // code.
 
     var finalImg = document.getElementById('image1');
-    finalImg.alt = "";
     finalImg.onload = finalImg.onerror = step3;
     finalImg.src = gImg.src;
   }
@@ -68,7 +67,8 @@
 </script>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
   // Use as "wrapper.html?image.png
   gImg = document.createElement('img');
diff --git a/image/test/reftest/ico/ico-png/wrapper.html b/image/test/reftest/ico/ico-png/wrapper.html
index 0015856df..45b516775 100644
--- a/image/test/reftest/ico/ico-png/wrapper.html
+++ b/image/test/reftest/ico/ico-png/wrapper.html
@@ -14,13 +14,13 @@
 </script>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
   // Use as "wrapper.html?image.png
   var imgURL = document.location.search.substr(1);
   document.images[0].onload = onImageLoad;
   document.images[0].onerror = onImageLoad;
-  document.images[0].alt = "";
   document.images[0].src = imgURL;
 </script>
 </body>
diff --git a/image/test/reftest/pngsuite-background/wrapper.html b/image/test/reftest/pngsuite-background/wrapper.html
index 5bbe75e01..45b516775 100644
--- a/image/test/reftest/pngsuite-background/wrapper.html
+++ b/image/test/reftest/pngsuite-background/wrapper.html
@@ -14,7 +14,8 @@
 </script>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
   // Use as "wrapper.html?image.png
   var imgURL = document.location.search.substr(1);
diff --git a/image/test/reftest/pngsuite-corrupted/wrapper.html b/image/test/reftest/pngsuite-corrupted/wrapper.html
index 0015856df..45b516775 100644
--- a/image/test/reftest/pngsuite-corrupted/wrapper.html
+++ b/image/test/reftest/pngsuite-corrupted/wrapper.html
@@ -14,13 +14,13 @@
 </script>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
   // Use as "wrapper.html?image.png
   var imgURL = document.location.search.substr(1);
   document.images[0].onload = onImageLoad;
   document.images[0].onerror = onImageLoad;
-  document.images[0].alt = "";
   document.images[0].src = imgURL;
 </script>
 </body>
diff --git a/image/test/reftest/pngsuite-transparency/wrapper.html b/image/test/reftest/pngsuite-transparency/wrapper.html
index 5bbe75e01..45b516775 100644
--- a/image/test/reftest/pngsuite-transparency/wrapper.html
+++ b/image/test/reftest/pngsuite-transparency/wrapper.html
@@ -14,7 +14,8 @@
 </script>
 </head>
 <body>
-<img id="image1">
+<!-- non-empty alt to avoid the broken image icon -->
+<img id="image1" alt=" ">
 <script>
   // Use as "wrapper.html?image.png
   var imgURL = document.location.search.substr(1);