diff --git a/testing/web-platform/meta/MANIFEST.json b/testing/web-platform/meta/MANIFEST.json
index 0a265d5628e6..39b1723347b0 100644
--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -521603,7 +521603,7 @@
    "reftest"
   ],
   "css/css-ui/outline-016.html": [
-   "7f0f176f67d2289edd2f4b03ea839375dea42753",
+   "844961a7256e822512ce9636bb00a5b005cd85c0",
    "reftest"
   ],
   "css/css-ui/outline-017.html": [
@@ -521731,7 +521731,7 @@
    "support"
   ],
   "css/css-ui/reference/text-overflow-008-ref.html": [
-   "1aeb23c5928c075cffbb7fc81a4b6e328f60fc06",
+   "7a84d24e0ae7e0d7e989bd27355c38edd5cd9ea1",
    "support"
   ],
   "css/css-ui/reference/text-overflow-012-ref.html": [
@@ -521739,7 +521739,7 @@
    "support"
   ],
   "css/css-ui/reference/text-overflow-013-ref.html": [
-   "414a9396a5972ec32b7d4b0e891c4b883b8bfb33",
+   "12e4a97d12c78c2b75d9b73cb71c3ee2a1bb8f6c",
    "support"
   ],
   "css/css-ui/reference/text-overflow-016-ref.html": [
@@ -522811,11 +522811,11 @@
    "reftest"
   ],
   "css/css-ui/text-overflow-007.html": [
-   "c4efe1edf35eaf83285d87829304ff371e33c76e",
+   "f0e8d74e17b9ab0056d054c246f4ed4afe113ea2",
    "reftest"
   ],
   "css/css-ui/text-overflow-008.html": [
-   "6dae594a6197701649c6fafcbc2f266131fcd041",
+   "6b1e836d65f14dcc4db92487d22038bbc2cce9cc",
    "reftest"
   ],
   "css/css-ui/text-overflow-009.html": [
@@ -522823,11 +522823,11 @@
    "reftest"
   ],
   "css/css-ui/text-overflow-010.html": [
-   "6f55e6742384c08368649656cda8f46aee5fe619",
+   "3d34d86b7da5bf415fd33355561ccc14cece6bd2",
    "reftest"
   ],
   "css/css-ui/text-overflow-011.html": [
-   "5ce16822f7171d50bc2e2659f9231cd33f5593ca",
+   "d9e640fe5df3cc195ca50b5b05d461d088d77a75",
    "reftest"
   ],
   "css/css-ui/text-overflow-012.html": [
@@ -522835,23 +522835,23 @@
    "reftest"
   ],
   "css/css-ui/text-overflow-013.html": [
-   "625eeabf9fad164337a1e40cbd038d3a6b471786",
+   "c018453292aeb6d50a44196f9e1210fa49c6533a",
    "reftest"
   ],
   "css/css-ui/text-overflow-014.html": [
-   "d3b43ba202011615e0fc2ccd80e742e7b7a22b84",
+   "43c75edc4da328c37c2752b17b0de7d7ee84bc91",
    "reftest"
   ],
   "css/css-ui/text-overflow-015.html": [
-   "ed90af2ad47fd37b3c40ae2c9ac2ae5c9343abf1",
+   "4227e04a07d4f4579975e52c72206afa1a4e126c",
    "reftest"
   ],
   "css/css-ui/text-overflow-016.html": [
-   "a1e53d9b311db7d49fcbffeb9a4632ec79bd5721",
+   "27ca5dc05eb9b63c4375b4c25f8c7053e6fd3d3a",
    "reftest"
   ],
   "css/css-ui/text-overflow-017.html": [
-   "03ae27b87d81b474cbea774f2f39ff32e654575c",
+   "207642926d54c3fc994f0aa08f895b1d9a29bf76",
    "manual"
   ],
   "css/css-ui/text-overflow-018.html": [
@@ -522863,7 +522863,7 @@
    "manual"
   ],
   "css/css-ui/text-overflow-020.html": [
-   "99c73b2e261a5526d7883572eb2ce61da0b58688",
+   "656848661c9300cc7b46dca5bc9cf4be324cbd21",
    "reftest"
   ],
   "css/css-ui/text-overflow-021.html": [
@@ -522875,7 +522875,7 @@
    "reftest"
   ],
   "css/css-ui/text-overflow-023.html": [
-   "4fd38a517e41851216d12db8c6b732d96f76e325",
+   "ccf66a31c62d53650bcc60b35c7b1912f67f1093",
    "testharness"
   ],
   "css/css-ui/text-overflow-024-ref.html": [
diff --git a/testing/web-platform/tests/css/css-ui/outline-016.html b/testing/web-platform/tests/css/css-ui/outline-016.html
index 0f9047c3f4b3..e62959cc2070 100644
--- a/testing/web-platform/tests/css/css-ui/outline-016.html
+++ b/testing/web-platform/tests/css/css-ui/outline-016.html
@@ -25,7 +25,7 @@ div {
   background: green;
   line-height: 25px;
   font-size: 25px;
-  font-family: ahem;
+  font-family: Ahem;
 }
 </style>
 
diff --git a/testing/web-platform/tests/css/css-ui/reference/text-overflow-008-ref.html b/testing/web-platform/tests/css/css-ui/reference/text-overflow-008-ref.html
index 4eb357f8e366..4af20b783e69 100644
--- a/testing/web-platform/tests/css/css-ui/reference/text-overflow-008-ref.html
+++ b/testing/web-platform/tests/css/css-ui/reference/text-overflow-008-ref.html
@@ -6,7 +6,7 @@
 div {
   font-size: 100px;
   line-height: 1;
-  font-family: ahem;
+  font-family: Ahem;
   overflow: hidden;
   width: 0.5em;
   color: green;
diff --git a/testing/web-platform/tests/css/css-ui/reference/text-overflow-013-ref.html b/testing/web-platform/tests/css/css-ui/reference/text-overflow-013-ref.html
index b4565a2402f3..9f6cbd0a085c 100644
--- a/testing/web-platform/tests/css/css-ui/reference/text-overflow-013-ref.html
+++ b/testing/web-platform/tests/css/css-ui/reference/text-overflow-013-ref.html
@@ -6,7 +6,7 @@
 .test {
   overflow: hidden;
   white-space: pre;
-  font: 100px/1 ahem;
+  font: 100px/1 Ahem;
   width: 2em;
 }
 .green {
diff --git a/testing/web-platform/tests/css/css-ui/text-overflow-007.html b/testing/web-platform/tests/css/css-ui/text-overflow-007.html
index bfc693978fe7..f33cb7993a61 100644
--- a/testing/web-platform/tests/css/css-ui/text-overflow-007.html
+++ b/testing/web-platform/tests/css/css-ui/text-overflow-007.html
@@ -9,7 +9,7 @@
 <style>
 .test {
   white-space: pre;
-  font: 50px/1 ahem;
+  font: 50px/1 Ahem;
   text-overflow: ellipsis;
   overflow: hidden;
   width: 2.5em; /* We will be fitting 2em worth of characters in a 2.5em space, to see where the extra .5em goes. It should be after, not between the characters.*/
diff --git a/testing/web-platform/tests/css/css-ui/text-overflow-008.html b/testing/web-platform/tests/css/css-ui/text-overflow-008.html
index 79c8443359e6..f22afc1d51f7 100644
--- a/testing/web-platform/tests/css/css-ui/text-overflow-008.html
+++ b/testing/web-platform/tests/css/css-ui/text-overflow-008.html
@@ -12,7 +12,7 @@
 -->
 <style>
 .test {
-  font: 100px/1 ahem;
+  font: 100px/1 Ahem;
   text-overflow: ellipsis;
   overflow: hidden;
   width: 0.5em;
diff --git a/testing/web-platform/tests/css/css-ui/text-overflow-010.html b/testing/web-platform/tests/css/css-ui/text-overflow-010.html
index 1556da394556..4cbcb45b1739 100644
--- a/testing/web-platform/tests/css/css-ui/text-overflow-010.html
+++ b/testing/web-platform/tests/css/css-ui/text-overflow-010.html
@@ -16,7 +16,7 @@
 }
 .test {
   white-space: pre;
-  font-family: ahem;
+  font-family: Ahem;
   text-overflow: ellipsis;
   overflow: hidden;
   width: 5.2em; /* making this 5.2em rather than 5em, to ensure that the atomic inline gets entirely hidden even if it is only partially obstructing */
diff --git a/testing/web-platform/tests/css/css-ui/text-overflow-011.html b/testing/web-platform/tests/css/css-ui/text-overflow-011.html
index 33ebd0bba3fb..60db1715c4cb 100644
--- a/testing/web-platform/tests/css/css-ui/text-overflow-011.html
+++ b/testing/web-platform/tests/css/css-ui/text-overflow-011.html
@@ -9,7 +9,7 @@
 <style>
 .test {
   white-space: pre;
-  font: 100px/1 ahem;
+  font: 100px/1 Ahem;
   color: green;
   overflow: hidden;
   text-overflow: ellipsis;
diff --git a/testing/web-platform/tests/css/css-ui/text-overflow-013.html b/testing/web-platform/tests/css/css-ui/text-overflow-013.html
index dd8f98670fd9..af56474d1d32 100644
--- a/testing/web-platform/tests/css/css-ui/text-overflow-013.html
+++ b/testing/web-platform/tests/css/css-ui/text-overflow-013.html
@@ -11,7 +11,7 @@
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: pre;
-  font: 100px/1 ahem;
+  font: 100px/1 Ahem;
   color: green;
 
   /* 2em width and starting with a space
diff --git a/testing/web-platform/tests/css/css-ui/text-overflow-014.html b/testing/web-platform/tests/css/css-ui/text-overflow-014.html
index 6e1e9898e4a4..380e5e4505c1 100644
--- a/testing/web-platform/tests/css/css-ui/text-overflow-014.html
+++ b/testing/web-platform/tests/css/css-ui/text-overflow-014.html
@@ -11,7 +11,7 @@
   overflow: hidden;
   text-overflow: ellipsis;
   white-space:pre;
-  font: 100px/1 ahem;
+  font: 100px/1 Ahem;
   color: green;
 
   /* 2em width and starting with a space
diff --git a/testing/web-platform/tests/css/css-ui/text-overflow-015.html b/testing/web-platform/tests/css/css-ui/text-overflow-015.html
index 8a6672c37a8f..2269d5ea930f 100644
--- a/testing/web-platform/tests/css/css-ui/text-overflow-015.html
+++ b/testing/web-platform/tests/css/css-ui/text-overflow-015.html
@@ -13,7 +13,7 @@ div {
   width: 100px;
   height: 100px;
   white-space: pre;
-  font: 20px/1 ahem;
+  font: 20px/1 Ahem;
   color: green;
   background: url("support/1x1-red.png") top right / 1em 1em no-repeat, green;
 }
diff --git a/testing/web-platform/tests/css/css-ui/text-overflow-016.html b/testing/web-platform/tests/css/css-ui/text-overflow-016.html
index 6e642ae689c8..e123adf5de34 100644
--- a/testing/web-platform/tests/css/css-ui/text-overflow-016.html
+++ b/testing/web-platform/tests/css/css-ui/text-overflow-016.html
@@ -12,7 +12,7 @@
   text-overflow: ellipsis;
   width: 100px;
   white-space: pre;
-  font: 50px/1 ahem;
+  font: 50px/1 Ahem;
   height: 20px;
   position: relative;
 }
diff --git a/testing/web-platform/tests/css/css-ui/text-overflow-017.html b/testing/web-platform/tests/css/css-ui/text-overflow-017.html
index 7e857bcc1035..05abb6125c01 100644
--- a/testing/web-platform/tests/css/css-ui/text-overflow-017.html
+++ b/testing/web-platform/tests/css/css-ui/text-overflow-017.html
@@ -15,7 +15,7 @@
   width: 2.5em;
   height: 1em;
   white-space: pre;
-  font: 100px/1 ahem;
+  font: 100px/1 Ahem;
   color: blue;
 }
 #discard {
diff --git a/testing/web-platform/tests/css/css-ui/text-overflow-020.html b/testing/web-platform/tests/css/css-ui/text-overflow-020.html
index caac6fb5393d..6134921ec924 100644
--- a/testing/web-platform/tests/css/css-ui/text-overflow-020.html
+++ b/testing/web-platform/tests/css/css-ui/text-overflow-020.html
@@ -16,7 +16,7 @@ div {
 }
 div > p {
   white-space: pre;
-  font: 40px/1 ahem;
+  font: 40px/1 Ahem;
   color: green;
   background: red;
   margin: 0;
diff --git a/testing/web-platform/tests/css/css-ui/text-overflow-023.html b/testing/web-platform/tests/css/css-ui/text-overflow-023.html
index ca3f8da3b1d5..a8122185dae1 100644
--- a/testing/web-platform/tests/css/css-ui/text-overflow-023.html
+++ b/testing/web-platform/tests/css/css-ui/text-overflow-023.html
@@ -19,7 +19,7 @@
 #parent {
   position: absolute;
   top: 0; left: 0;
-  font: 50px / 1  ahem ;
+  font: 50px/1 Ahem ;
   overflow: hidden;
   width: 3em;
   text-overflow: ellipsis;