diff --git a/resources/presentational-hints.css b/resources/presentational-hints.css
index 8c701ec0405..84157dcb4bd 100644
--- a/resources/presentational-hints.css
+++ b/resources/presentational-hints.css
@@ -133,7 +133,7 @@ hr[color], hr[noshade] { border-style: solid; }
-iframe[frameborder=0], iframe[frameborder=no i] { border: none; }
+iframe[frameborder="0"], iframe[frameborder=no i] { border: none; }
applet[align=left i], embed[align=left i], iframe[align=left i], img[type=image i][align=left i], object[align=left i] {
float: left;
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 1be92d74c52..f5149986b21 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -1916,6 +1916,18 @@
"url": "/_mozilla/css/iframe/bg_color.html"
}
],
+ "css/iframe/frameborder_a.html": [
+ {
+ "path": "css/iframe/frameborder_a.html",
+ "references": [
+ [
+ "/_mozilla/css/iframe/frameborder_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/iframe/frameborder_a.html"
+ }
+ ],
"css/iframe/hide_after_load.html": [
{
"path": "css/iframe/hide_after_load.html",
@@ -15764,6 +15776,18 @@
"url": "/_mozilla/css/iframe/bg_color.html"
}
],
+ "css/iframe/frameborder_a.html": [
+ {
+ "path": "css/iframe/frameborder_a.html",
+ "references": [
+ [
+ "/_mozilla/css/iframe/frameborder_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/iframe/frameborder_a.html"
+ }
+ ],
"css/iframe/hide_after_load.html": [
{
"path": "css/iframe/hide_after_load.html",
diff --git a/tests/wpt/mozilla/tests/css/iframe/frameborder_a.html b/tests/wpt/mozilla/tests/css/iframe/frameborder_a.html
new file mode 100644
index 00000000000..c81be895aa0
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/iframe/frameborder_a.html
@@ -0,0 +1,6 @@
+
+
+
+
+
+
diff --git a/tests/wpt/mozilla/tests/css/iframe/frameborder_ref.html b/tests/wpt/mozilla/tests/css/iframe/frameborder_ref.html
new file mode 100644
index 00000000000..713df0ad4ae
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/iframe/frameborder_ref.html
@@ -0,0 +1,5 @@
+
+
+
+
+