From 086c044dc34dfc0f74fbe41f4ecb402b2cd34884 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 03:13:33 +0200
Subject: Merging upstream version 125.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../css-anchor-position/position-try-dynamic.html  | 35 ++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 testing/web-platform/tests/css/css-anchor-position/position-try-dynamic.html

(limited to 'testing/web-platform/tests/css/css-anchor-position/position-try-dynamic.html')
diff --git a/testing/web-platform/tests/css/css-anchor-position/position-try-dynamic.html b/testing/web-platform/tests/css/css-anchor-position/position-try-dynamic.html
new file mode 100644
index 0000000000..fad3db62a3
--- /dev/null
+++ b/testing/web-platform/tests/css/css-anchor-position/position-try-dynamic.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<title>CSS Anchor Positioning Test: Dynamically change position via position-try-options property</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  body { margin: 0; }
+
+  @position-try --fallback1 {
+    left: anchor(--a1 right);
+  }
+  #anchor {
+    anchor-name: --a1;
+    width: 100px;
+    height: 100px;
+  }
+  #anchored {
+    position: absolute;
+    left: 999999px; /* Force fallback */
+    width: 100px;
+    height: 100px;
+  }
+</style>
+<div id="anchor"></div>
+<div id="anchored"></div>
+<script>
+  test(() => {
+    assert_equals(anchored.offsetLeft, 999999);
+  }, "Initial static left position is 0");
+
+  test(() => {
+    anchored.style.positionTryOptions = "--fallback1";
+    assert_equals(anchored.offsetLeft, 100);
+  }, "Left position set to right edge of anchor with @position-try");
+</script>
-- 
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