From 5edf942b7078fe20ac3b7f09802e1e1badfd3c2b Mon Sep 17 00:00:00 2001
From: Xiaocheng Hu <xiaochengh@chromium.org>
Date: Thu, 13 Apr 2023 04:34:05 +0000
Subject: [PATCH] Bug 1823833 [wpt PR 39133] - [anchor-position] Resolve anchor
 functions in getComputedStyle(), a=testonly

Automatic update from web-platform-tests
[anchor-position] Resolve anchor functions in getComputedStyle()

Currently, when getComputedStyle() returns values for `left` etc,
it needs to re-resolve them (after layout) into a pixel value.

This patch provides an NGAnchorEvaluatorImpl for the resolution, so
that anchor functions can also be resolved.

There are also a few cases that are unsolved and left for future.
They are marked with TODOs.

Bug: 1423493
Change-Id: I319543230008e61a8363fdebb111a9840adc6e5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4330385
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1127332}

--

wpt-commits: e5d08dfdc81c07e54c0904996e972ccde18539ac
wpt-pr: 39133
---
 .../anchor-getComputedStyle.html                   | 124 +++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 testing/web-platform/tests/css/css-anchor-position/anchor-getComputedStyle.html
diff --git a/testing/web-platform/tests/css/css-anchor-position/anchor-getComputedStyle.html b/testing/web-platform/tests/css/css-anchor-position/anchor-getComputedStyle.html
new file mode 100644
index 000000000000..cce571c4d0d3
--- /dev/null
+++ b/testing/web-platform/tests/css/css-anchor-position/anchor-getComputedStyle.html
@@ -0,0 +1,124 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Tests that getComputedStyle() resolves anchor functions</title>
+<link rel="help" href="https://drafts4.csswg.org/css-anchor-position-1">
+<link rel="help" href="https://w3c.github.io/csswg-drafts/cssom/#resolved-value">
+<link rel="author" href="mailto:xiaochengh@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.vrl { writing-mode: vertical-rl; }
+.htb { writing-mode: horizontal-tb; }
+.ltr { direction: ltr; }
+.rtl { direction: rtl; }
+
+.cb {
+  transform: scale(1);
+  width: 200px;
+  height: 150px;
+  outline: 1px dashed black;
+}
+
+.padding-10 {
+  box-sizing: border-box;
+  padding: 10px;
+}
+
+.anchor {
+  width: 40px;
+  height: 30px;
+  background: orange;
+  anchor-name: --a;
+  position: relative;
+  top: 50px;
+  left: 60px;
+}
+
+.anchored-topleft {
+  position: absolute;
+  width: anchor-size(--a width);
+  height: anchor-size(--a height);
+  bottom: anchor(--a top);
+  right: anchor(--a left);
+  background: lime;
+}
+
+.anchored-bottomright {
+  position: absolute;
+  width: anchor-size(--a width);
+  height: anchor-size(--a height);
+  top: anchor(--a bottom);
+  left: anchor(--a right);
+  background: lime;
+}
+</style>
+
+<div class=cb id=test1>
+  <div class=anchor></div>
+  <div class=anchored-topleft></div>
+  <div class=anchored-bottomright></div>
+</div>
+<script>
+test(() => {
+  const container = document.getElementById('test1');
+
+  const topleft = container.querySelector('.anchored-topleft');
+  assert_equals(getComputedStyle(topleft).bottom, '100px');
+  assert_equals(getComputedStyle(topleft).right, '140px');
+  assert_equals(getComputedStyle(topleft).width, '40px');
+  assert_equals(getComputedStyle(topleft).height, '30px');
+
+  const bottomright = container.querySelector('.anchored-bottomright');
+  assert_equals(getComputedStyle(bottomright).top, '80px');
+  assert_equals(getComputedStyle(bottomright).left, '100px');
+  assert_equals(getComputedStyle(bottomright).width, '40px');
+  assert_equals(getComputedStyle(bottomright).height, '30px');
+}, 'Basic case');
+</script>
+
+<div class="cb vrl" id=test2>
+  <div class=anchor></div>
+  <div class="anchored-topleft htb ltr"></div>
+  <div class="anchored-bottomright htb rtl"></div>
+</div>
+<script>
+test(() => {
+  const container = document.getElementById('test2');
+
+  const topleft = container.querySelector('.anchored-topleft');
+  assert_equals(getComputedStyle(topleft).bottom, '100px');
+  assert_equals(getComputedStyle(topleft).right, '-20px');
+  assert_equals(getComputedStyle(topleft).width, '40px');
+  assert_equals(getComputedStyle(topleft).height, '30px');
+
+  const bottomright = container.querySelector('.anchored-bottomright');
+  assert_equals(getComputedStyle(bottomright).top, '80px');
+  assert_equals(getComputedStyle(bottomright).left, '260px');
+  assert_equals(getComputedStyle(bottomright).width, '40px');
+  assert_equals(getComputedStyle(bottomright).height, '30px');
+}, 'Mixed writing modes and directions');
+</script>
+
+<div class="cb padding-10" id=test3>
+  <div class=anchor></div>
+  <div class=anchored-topleft></div>
+  <div class=anchored-bottomright></div>
+</div>
+<script>
+test(() => {
+  const container = document.getElementById('test3');
+
+  const topleft = container.querySelector('.anchored-topleft');
+  assert_equals(getComputedStyle(topleft).bottom, '90px');
+  assert_equals(getComputedStyle(topleft).right, '130px');
+  assert_equals(getComputedStyle(topleft).width, '40px');
+  assert_equals(getComputedStyle(topleft).height, '30px');
+
+  const bottomright = container.querySelector('.anchored-bottomright');
+  assert_equals(getComputedStyle(bottomright).top, '90px');
+  assert_equals(getComputedStyle(bottomright).left, '110px');
+  assert_equals(getComputedStyle(bottomright).width, '40px');
+  assert_equals(getComputedStyle(bottomright).height, '30px');
+}, 'With containing block padding');
+</script>
+
-- 
2.11.4.GIT

