diff --git a/tests/wpt/metadata/html/infrastructure/common-dom-interfaces/collections/htmloptionscollection.html.ini b/tests/wpt/metadata/html/infrastructure/common-dom-interfaces/collections/htmloptionscollection.html.ini
index eb045799edd..4ea1f777183 100644
--- a/tests/wpt/metadata/html/infrastructure/common-dom-interfaces/collections/htmloptionscollection.html.ini
+++ b/tests/wpt/metadata/html/infrastructure/common-dom-interfaces/collections/htmloptionscollection.html.ini
@@ -17,3 +17,4 @@
 
   [HTMLOptionsCollection.add method insert HTMLOptionElement Option element]
     expected: FAIL
+
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index fc7ee02cb96..61103659ba0 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -5946,6 +5946,54 @@
             "url": "/_mozilla/css/width_nonreplaced_block_simple_a.html"
           }
         ],
+        "css/word-break-keep-all-005.htm": [
+          {
+            "path": "css/word-break-keep-all-005.htm",
+            "references": [
+              [
+                "/_mozilla/css/word-break-keep-all-ref-005.htm",
+                "=="
+              ]
+            ],
+            "url": "/_mozilla/css/word-break-keep-all-005.htm"
+          }
+        ],
+        "css/word-break-keep-all-006.htm": [
+          {
+            "path": "css/word-break-keep-all-006.htm",
+            "references": [
+              [
+                "/_mozilla/css/word-break-keep-all-ref-006.htm",
+                "=="
+              ]
+            ],
+            "url": "/_mozilla/css/word-break-keep-all-006.htm"
+          }
+        ],
+        "css/word-break-keep-all-007.htm": [
+          {
+            "path": "css/word-break-keep-all-007.htm",
+            "references": [
+              [
+                "/_mozilla/css/word-break-keep-all-ref-007.htm",
+                "=="
+              ]
+            ],
+            "url": "/_mozilla/css/word-break-keep-all-007.htm"
+          }
+        ],
+        "css/word-break-keep-all-008.htm": [
+          {
+            "path": "css/word-break-keep-all-008.htm",
+            "references": [
+              [
+                "/_mozilla/css/word-break-keep-all-ref-008.htm",
+                "=="
+              ]
+            ],
+            "url": "/_mozilla/css/word-break-keep-all-008.htm"
+          }
+        ],
         "css/word-spacing.html": [
           {
             "path": "css/word-spacing.html",
@@ -19584,6 +19632,54 @@
           "url": "/_mozilla/css/width_nonreplaced_block_simple_a.html"
         }
       ],
+      "css/word-break-keep-all-005.htm": [
+        {
+          "path": "css/word-break-keep-all-005.htm",
+          "references": [
+            [
+              "/_mozilla/css/word-break-keep-all-ref-005.htm",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/css/word-break-keep-all-005.htm"
+        }
+      ],
+      "css/word-break-keep-all-006.htm": [
+        {
+          "path": "css/word-break-keep-all-006.htm",
+          "references": [
+            [
+              "/_mozilla/css/word-break-keep-all-ref-006.htm",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/css/word-break-keep-all-006.htm"
+        }
+      ],
+      "css/word-break-keep-all-007.htm": [
+        {
+          "path": "css/word-break-keep-all-007.htm",
+          "references": [
+            [
+              "/_mozilla/css/word-break-keep-all-ref-007.htm",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/css/word-break-keep-all-007.htm"
+        }
+      ],
+      "css/word-break-keep-all-008.htm": [
+        {
+          "path": "css/word-break-keep-all-008.htm",
+          "references": [
+            [
+              "/_mozilla/css/word-break-keep-all-ref-008.htm",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/css/word-break-keep-all-008.htm"
+        }
+      ],
       "css/word-spacing.html": [
         {
           "path": "css/word-spacing.html",
diff --git a/tests/wpt/mozilla/meta/css/word-break-keep-all-008.htm.ini b/tests/wpt/mozilla/meta/css/word-break-keep-all-008.htm.ini
new file mode 100644
index 00000000000..3c59220918d
--- /dev/null
+++ b/tests/wpt/mozilla/meta/css/word-break-keep-all-008.htm.ini
@@ -0,0 +1,3 @@
+[word-break-keep-all-008.htm]
+  type: reftest
+  expected: FAIL
diff --git a/tests/wpt/mozilla/tests/css/word-break-keep-all-005.htm b/tests/wpt/mozilla/tests/css/word-break-keep-all-005.htm
new file mode 100644
index 00000000000..5bf0022a007
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/word-break-keep-all-005.htm
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html lang="en"><head>
+<meta charset="utf-8">
+<title>word-break: keep-all, latin</title>
+<meta content="word-break: keep-all means breaking is forbidden within 'words'." name="assert">
+<link href="https://drafts.csswg.org/css-text-3/#word-break-property" rel="help">
+<link href="word-break-keep-all-ref-005.htm" rel="match">
+<link href="mailto:ishida@w3.org" rel="author" title="Richard Ishida">
+<style type="text/css">
+.test { word-break: keep-all; }
+/* the CSS below is not part of the test */
+.test, .ref { border: 1px solid orange;  margin: 20px;  padding: 10px; width: 390px; font: 36px/1 sans-serif; }
+</style>
+</head>
+<body>
+<div id="instructions">Test passes if the two orange boxes are the same.</div>
+<div class="test"><div id="testdiv"><span id="testspan">Latin latin latin latin</span></div></div>
+<div class="ref"><span>Latin latin latin<br>latin</span></div>
+<script>
+var sentenceWidth = document.getElementById('testspan').getBoundingClientRect().width;
+document.getElementById('testdiv').style.width = String(sentenceWidth - 5)+'px'
+</script>
+
+</body></html>
diff --git a/tests/wpt/mozilla/tests/css/word-break-keep-all-006.htm b/tests/wpt/mozilla/tests/css/word-break-keep-all-006.htm
new file mode 100644
index 00000000000..17eb109a001
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/word-break-keep-all-006.htm
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html lang="en"><head>
+<meta charset="utf-8">
+<title>word-break: keep-all, japanese</title>
+<meta content="word-break: keep-all means breaking is forbidden within 'words'.  In this style, sequences of CJK characters do not break." name="assert">
+<link href="https://drafts.csswg.org/css-text-3/#word-break-property" rel="help">
+<link href="word-break-keep-all-ref-006.htm" rel="match">
+<style type="text/css">
+.test { word-break: keep-all; }
+/* the CSS below is not part of the test */
+.test, .ref { border: 1px solid orange;  margin: 20px;  padding: 10px; width: 390px; font: 36px/1 sans-serif ; }
+</style>
+</head>
+<body>
+<div id="instructions">Test passes if the two orange boxes are the same.</div>
+<div lang="ja" class="test"><div id="testdiv"><span id="testspan">日本語 日本語 日本語</span></div></div>
+<div lang="ja" class="ref"><span>日本語 日本語<br>日本語</span></div>
+<script>
+var sentenceWidth = document.getElementById('testspan').getBoundingClientRect().width;
+document.getElementById('testdiv').style.width = String(sentenceWidth - 5)+'px'
+</script>
+
+</body></html>
diff --git a/tests/wpt/mozilla/tests/css/word-break-keep-all-007.htm b/tests/wpt/mozilla/tests/css/word-break-keep-all-007.htm
new file mode 100644
index 00000000000..ac1385ff8c9
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/word-break-keep-all-007.htm
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html lang="en"><head>
+<meta charset="utf-8">
+<title>word-break: keep-all, korean</title>
+<meta content="word-break: keep-all means breaking is forbidden within 'words'.  In this style, sequences of CJK characters do not break." name="assert">
+<link href="https://drafts.csswg.org/css-text-3/#word-break-property" rel="help">
+<link href="word-break-keep-all-ref-007.htm" rel="match">
+<style type="text/css">
+.test { word-break: keep-all; }
+/* the CSS below is not part of the test */
+.test, .ref { border: 1px solid orange;  margin: 20px;  padding: 10px; width: 390px; font: 36px/1 sans-serif; }
+</style>
+</head>
+<body>
+<div id="instructions">Test passes if the two orange boxes are the same.</div>
+<div lang="ko" class="test"><div id="testdiv"><span id="testspan">한글이 한글이 한글이</span></div></div>
+<div lang="ko" class="ref"><span>한글이 한글이<br>한글이</span></div>
+<script>
+var sentenceWidth = document.getElementById('testspan').getBoundingClientRect().width;
+document.getElementById('testdiv').style.width = String(sentenceWidth - 5)+'px'
+</script>
+
+</body></html>
diff --git a/tests/wpt/mozilla/tests/css/word-break-keep-all-008.htm b/tests/wpt/mozilla/tests/css/word-break-keep-all-008.htm
new file mode 100644
index 00000000000..2b935f80f11
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/word-break-keep-all-008.htm
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html lang="en"><head>
+<meta charset="utf-8">
+<title>word-break: keep-all, thai</title>
+<meta content="word-break: keep-all means breaking is forbidden within 'words',  except where opportunities exist due to dictionary-based breaking (such as in Thai)." name="assert">
+<link href="https://drafts.csswg.org/css-text-3/#word-break-property" rel="help">
+<link href="word-break-keep-all-ref-008.htm" rel="match">
+<style type="text/css">
+.test { word-break: keep-all; }
+/* the CSS below is not part of the test */
+.test, .ref { border: 1px solid orange;  margin: 20px;  padding: 10px; width: 390px; font: 36px/1 sans-serif; }
+</style>
+</head>
+<body>
+<div id="instructions">Test passes if the two orange boxes are the same.</div>
+<div lang="th" class="test"><div id="testdiv"><span id="testspan">แและ แและแและ</span></div></div>
+<div lang="th" class="ref"><span>แและ แและ<br>แและ</span></div>
+<script>
+var sentenceWidth = document.getElementById('testspan').getBoundingClientRect().width;
+document.getElementById('testdiv').style.width = String(sentenceWidth - 5)+'px'
+</script>
+
+</body></html>
diff --git a/tests/wpt/mozilla/tests/css/word-break-keep-all-ref-005.htm b/tests/wpt/mozilla/tests/css/word-break-keep-all-ref-005.htm
new file mode 100644
index 00000000000..156b202ba8d
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/word-break-keep-all-ref-005.htm
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="en"><head>
+<meta charset="utf-8">
+<title>word-break: keep-all, latin</title>
+<link href="mailto:ishida@w3.org" rel="author" title="Richard Ishida">
+<style type="text/css">
+.test { word-break: keep-all; }
+/* the CSS below is not part of the test */
+.test, .ref { border: 1px solid orange;  margin: 20px;  padding: 10px; width: 390px; font: 36px/1 sans-serif; }
+</style>
+</head>
+<body>
+<div id="instructions">Test passes if the two orange boxes are the same.</div>
+<div class="ref"><span>Latin latin latin<br>latin</span></div>
+<div class="ref"><span>Latin latin latin<br>latin</span></div>
+
+</body></html>
diff --git a/tests/wpt/mozilla/tests/css/word-break-keep-all-ref-006.htm b/tests/wpt/mozilla/tests/css/word-break-keep-all-ref-006.htm
new file mode 100644
index 00000000000..118e9630e38
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/word-break-keep-all-ref-006.htm
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="en"><head>
+<meta charset="utf-8">
+<title>word-break: keep-all, japanese</title>
+<link href="mailto:ishida@w3.org" rel="author" title="Richard Ishida">
+<style type="text/css">
+.test { word-break: keep-all; }
+/* the CSS below is not part of the test */
+.test, .ref { border: 1px solid orange;  margin: 20px;  padding: 10px; width: 390px; font: 36px/1 sans-serif; }
+</style>
+</head>
+<body>
+<div id="instructions">Test passes if the two orange boxes are the same.</div>
+<div lang="ja" class="ref"><span>日本語 日本語<br>日本語</span></div>
+<div lang="ja" class="ref"><span>日本語 日本語<br>日本語</span></div>
+
+</body></html>
diff --git a/tests/wpt/mozilla/tests/css/word-break-keep-all-ref-007.htm b/tests/wpt/mozilla/tests/css/word-break-keep-all-ref-007.htm
new file mode 100644
index 00000000000..11161b43696
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/word-break-keep-all-ref-007.htm
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="en"><head>
+<meta charset="utf-8">
+<title>word-break: keep-all, korean</title>
+<link href="mailto:ishida@w3.org" rel="author" title="Richard Ishida">
+<style type="text/css">
+.test { word-break: keep-all; }
+/* the CSS below is not part of the test */
+.test, .ref { border: 1px solid orange;  margin: 20px;  padding: 10px; width: 390px; font: 36px/1 sans-serif; }
+</style>
+</head>
+<body>
+<div id="instructions">Test passes if the two orange boxes are the same.</div>
+<div lang="ko" class="ref"><span>한글이 한글이<br>한글이</span></div>
+<div lang="ko" class="ref"><span>한글이 한글이<br>한글이</span></div>
+
+</body></html>
diff --git a/tests/wpt/mozilla/tests/css/word-break-keep-all-ref-008.htm b/tests/wpt/mozilla/tests/css/word-break-keep-all-ref-008.htm
new file mode 100644
index 00000000000..bf2e5f58edb
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/word-break-keep-all-ref-008.htm
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="en"><head>
+<meta charset="utf-8">
+<title>word-break: keep-all, thai</title>
+<link href="mailto:ishida@w3.org" rel="author" title="Richard Ishida">
+<style type="text/css">
+.test { word-break: keep-all; }
+/* the CSS below is not part of the test */
+.test, .ref { border: 1px solid orange;  margin: 20px;  padding: 10px; width: 390px; font: 36px/1 sans-serif; }
+</style>
+</head>
+<body>
+<div id="instructions">Test passes if the two orange boxes are the same.</div>
+<div lang="th" class="ref"><span>แและ แและ<br>แและ</span></div>
+<div lang="th" class="ref"><span>แและ แและ<br>แและ</span></div>
+
+</body></html>