diff --git a/testing/web-platform/tests/html/dom/elements/global-attributes/dir-auto-dynamic-changes.window.js b/testing/web-platform/tests/html/dom/elements/global-attributes/dir-auto-dynamic-changes.window.js
index 28be3f9936ef..979c73800a45 100644
--- a/testing/web-platform/tests/html/dom/elements/global-attributes/dir-auto-dynamic-changes.window.js
+++ b/testing/web-platform/tests/html/dom/elements/global-attributes/dir-auto-dynamic-changes.window.js
@@ -376,23 +376,17 @@ test(() => {
 }, 'dir=auto slot is not affected by text in value of input element children');
 
 test(() => {
-  let [tree, shadow] = setup_tree(`
+  let tree = setup_tree(`
     <div>
-      <div id=root>
-        <input value="اختبر">
-        abc
-      </div>
+      <input dir="auto" value="اختبر">
     </div>
-  `,`
-    <slot dir=auto></slot>
   `);
-  let slot = shadow.querySelector("slot");
-  assert_equals(html_direction(slot), "rtl");
   let inp = tree.querySelector("input");
+  assert_equals(html_direction(inp), "rtl");
   inp.type = "month";
-  assert_equals(html_direction(slot), "ltr");
+  assert_equals(html_direction(inp), "ltr");
   tree.remove();
-}, 'dir=auto slot is updated if input stops being auto-directionality form-associated');
+}, 'input direction changes if it stops being auto-directionality form-associated');
 
 test(() => {
   let [tree, shadow] = setup_tree(`
diff --git a/testing/web-platform/tests/html/dom/elements/global-attributes/dir-slots-directionality.html b/testing/web-platform/tests/html/dom/elements/global-attributes/dir-slots-directionality.html
index f482d44b3329..7a16e38de125 100644
--- a/testing/web-platform/tests/html/dom/elements/global-attributes/dir-slots-directionality.html
+++ b/testing/web-platform/tests/html/dom/elements/global-attributes/dir-slots-directionality.html
@@ -225,4 +225,51 @@
   tree.remove();
 }, 'dir=auto slot ignores text in value of input element children');
 
+test(() => {
+  let [tree, shadow] = setup_tree(`
+    <div>
+      <div id=root>
+        <input value="اختبر">
+        <input type=text value="اختبر">
+        abc
+      </div>
+    </div>
+  `,`
+    <slot dir=auto></slot>
+  `);
+  let slot = shadow.querySelector("slot");
+  assert_equals(html_direction(slot), "ltr");
+  tree.remove();
+}, 'dir=auto slot is not affected by value of auto-directionality form associated elements');
+
+test(() => {
+  let [tree, shadow] = setup_tree(`
+    <div>
+      <div id=root><div slot="inner">اختبر</div></div>
+    </div>
+  `,`
+    <slot name="outer">
+      <slot name="inner" dir="auto"></slot>
+    </slot>
+  `);
+  let slot = shadow.querySelector("slot[name='inner']");
+  assert_equals(html_direction(slot), "rtl");
+  tree.remove();
+}, 'inner slot is given directionality from slotted content');
+
+test(() => {
+  let [tree, shadow] = setup_tree(`
+    <div>
+      <div id=root><div slot="inner">اختبر</div></div>
+    </div>
+  `,`
+    <slot name="outer" dir=auto>
+    </slot>
+  `);
+  let slot = shadow.querySelector("slot[name='outer']");
+  slot.innerHTML = "<slot name='inner'></slot>";
+  assert_equals(html_direction(slot), "ltr");
+  tree.remove();
+}, 'dir=auto slot is not affected by content inside inner slot (version 1)');
+
 </script>