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diff --git a/layout/base/tests/bug1634543-1.html b/layout/base/tests/bug1634543-1.html
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+++ b/layout/base/tests/bug1634543-1.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html class="reftest-wait">
+<title>Caret is correctly position for block whose only child is an abspos pseudo</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<style>
+  div:focus {
+    outline: 3px solid blue;
+  }
+  div::before {
+    content: "";
+    /* This is the point of the test */
+    position: absolute;
+  }
+</style>
+<div contenteditable="true" spellcheck="false"></div>
+<script>
+SimpleTest.waitForFocus(function() {
+  document.querySelector('[contenteditable="true"]').focus();
+  requestAnimationFrame(function() {
+    requestAnimationFrame(function() {
+      document.documentElement.removeAttribute("class");
+    });
+  });
+});
+</script>