1 files changed, 101 insertions, 0 deletions
diff --git a/dom/grid/test/chrome/test_grid_line_numbers.html b/dom/grid/test/chrome/test_grid_line_numbers.html
new file mode 100644
index 000000000..c8e5226b6
--- /dev/null
+++ b/dom/grid/test/chrome/test_grid_line_numbers.html
@@ -0,0 +1,101 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<script type="text/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+<style>
+body {
+  margin: 40px;
+}
+.wrapper {
+  display: grid;
+  grid-gap: 0px;
+  background-color: #f00;
+}
+.wrapper > div {
+  background-color: #444;
+  color: #fff;
+}
+.repeatColumns {
+  width: 600px;
+  grid-auto-columns: 50px;
+  grid-template-columns: repeat(auto-fit, 100px);
+}
+.repeatRows {
+  height: 600px;
+  grid-auto-rows: 50px;
+  grid-template-rows: repeat(auto-fit, 100px);
+}
+</style>
+
+<script>
+'use strict';
+
+SimpleTest.waitForExplicitFinish();
+
+function testLines(elementName, lines, expectedValues) {
+  is(lines.count, expectedValues.count, elementName + " has expected number of lines.");
+  for (let i = 0; i < lines.length; i++) {
+    is(lines[i].number, expectedValues[i].number, elementName + " line index " + i + " has expected number.");
+  }
+}
+
+function runTests() {
+  let grid;
+  let lines;
+  let expectedValues;
+
+  grid = document.getElementById("gridWithColumns").getGridFragments()[0];
+  lines = grid.cols.lines;
+  expectedValues = [
+    { "number": 0 },
+    { "number": 0 },
+    { "number": 1 },
+    { "number": 2 },
+    { "number": 3 },
+    { "number": 4 },
+    { "number": 5 },
+    { "number": 6 },
+    { "number": 7 },
+    { "number": 8 },
+  ];
+  testLines("gridWithColumns", lines, expectedValues);
+
+  grid = document.getElementById("gridWithRows").getGridFragments()[0];
+  lines = grid.rows.lines;
+  expectedValues = [
+    { "number": 0 },
+    { "number": 0 },
+    { "number": 1 },
+    { "number": 2 },
+    { "number": 3 },
+    { "number": 4 },
+    { "number": 5 },
+    { "number": 6 },
+    { "number": 7 },
+    { "number": 8 },
+  ];
+  testLines("gridWithRows", lines, expectedValues);
+
+  SimpleTest.finish();
+}
+</script>
+</head>
+<body onLoad="runTests();">
+
+<div id="gridWithColumns" class="wrapper repeatColumns">
+<div style="grid-column: -9">A</div>
+<div style="grid-column: 4">B</div>
+<div style="grid-column: 7">C</div>
+</div>
+
+<div id="gridWithRows" class="wrapper repeatRows">
+<div style="grid-row: span 3 / 2">A</div>
+<div style="grid-row: 4">B</div>
+<div style="grid-row: 5">C</div>
+<div style="grid-row: span 2 / 8">D</div>
+</div>
+
+</body>
+</html>