1 files changed, 117 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/cssom-view/scrollIntoView-vertical-rl-writing-mode.html b/testing/web-platform/tests/css/cssom-view/scrollIntoView-vertical-rl-writing-mode.html
new file mode 100644
index 0000000000..dc5f3e2cdb
--- /dev/null
+++ b/testing/web-platform/tests/css/cssom-view/scrollIntoView-vertical-rl-writing-mode.html
@@ -0,0 +1,117 @@
+<!DOCTYPE html>
+<title>CSSOM View - scrollIntoView considers vertical-rl writing mode</title>
+<meta charset="utf-8">
+<link rel="author" title="Suneel Kota" href="mailto:suneel.kota@samsung.com">
+<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<style>
+.box {
+  float: left;
+  width: 200px;
+  height: 200px;
+}
+#scroller {
+  writing-mode: vertical-rl;
+  overflow: scroll;
+  width: 300px;
+  height: 300px;
+}
+#container{
+  width: 600px;
+  height: 600px;
+}
+#target {
+  background-color: #ff0;
+}
+</style>
+<body>
+<div id="scroller">
+  <div id="container">
+    <!-- ROW-1 -->
+    <div class="row">
+      <div class="box"></div>
+      <div class="box"></div>
+      <div class="box"></div>
+    </div>
+
+    <!-- ROW-2 -->
+    <div class="row">
+      <div class="box"></div>
+      <div class="box" id="target"></div>
+      <div class="box"></div>
+    </div>
+
+    <!-- ROW-3 -->
+    <div class="row">
+      <div class="box"></div>
+      <div class="box"></div>
+      <div class="box"></div>
+    </div>
+  </div>
+</div>
+
+<script>
+// In vertical-rl mode, X corresponds to the block axis and is oriented
+// leftward. Y corresponds to the inline axis and is oriented downward.
+// So the beginning edges are the top and right edges and the ending
+// edges are the bottom and left edges.
+
+// This assumes that the horizontal scrollbar is on the bottom side.
+
+var target = document.getElementById("target");
+var scroller = document.getElementById("scroller");
+var scrollbar_width = scroller.offsetWidth - scroller.clientWidth;
+
+var scroller_width = scroller.offsetWidth;
+var scroller_height = scroller.offsetHeight;
+var box_width = target.offsetWidth;
+var box_height = target.offsetHeight;
+
+var expectedX;
+// If scroll bar is on the left side, scroller.scrollLeft won't get bigger than 0,
+scroller.scrollLeft = scrollbar_width;
+if (scroller.scrollLeft == 0) {
+  expectedX = {
+    blockStart: -box_width,
+    blockCenter: -(((3*box_width - scroller_width)/2) + (scrollbar_width/2)),
+    blockEnd: -(((2*box_width) - scroller_width) + scrollbar_width),
+  };
+} else {
+  expectedX = {
+    blockStart: -(box_width - scrollbar_width),
+    blockCenter: -(((3*box_width - scroller_width)/2) + (scrollbar_width/2) - scrollbar_width),
+    blockEnd: -((2*box_width) - scroller_width),
+  };
+}
+
+var expectedY = {
+  inlineStart: box_height,
+  inlineCenter: ((3*box_height - scroller_height)/2) + (scrollbar_width/2),
+  inlineEnd: ((2*box_height) - scroller_height) + scrollbar_width,
+};
+
+[
+  [{block: "start", inline: "start"}, expectedX.blockStart, expectedY.inlineStart],
+  [{block: "start", inline: "center"}, expectedX.blockStart, expectedY.inlineCenter],
+  [{block: "start", inline: "end"}, expectedX.blockStart, expectedY.inlineEnd],
+  [{block: "center", inline: "start"}, expectedX.blockCenter, expectedY.inlineStart],
+  [{block: "center", inline: "center"}, expectedX.blockCenter, expectedY.inlineCenter],
+  [{block: "center", inline: "end"}, expectedX.blockCenter, expectedY.inlineEnd],
+  [{block: "end", inline: "start"}, expectedX.blockEnd, expectedY.inlineStart],
+  [{block: "end", inline: "center"}, expectedX.blockEnd, expectedY.inlineCenter],
+  [{block: "end", inline: "end"}, expectedX.blockEnd, expectedY.inlineEnd],
+].forEach(([input, expectedX, expectedY]) => {
+  test(() => {
+    scroller.scrollTo(0, 0);
+    target.scrollIntoView(input);
+    assert_approx_equals(scroller.scrollLeft, expectedX, 0.5, "scrollX");
+    assert_approx_equals(scroller.scrollTop, expectedY, 0.5, "scrollY");
+  }, `scrollIntoView(${JSON.stringify(input)})`);
+})
+
+</script>
+
+</body>
+</html>