zoomed-alignment-baseline.html | Explore in Territory

<!doctype html>
<title>Test that alignment-baseline is unaffected by zoom level</title>
<script src="../../resources/ahem.js"></script>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<svg width="250" height="140" viewBox="0 0 250 140"
     xmlns="http://www.w3.org/2000/svg" version="1.1">
  <style>
    text {
        font-family: ahem;
        font-size: 20px;
    }
  </style>
  <text x="15" y="40">before<tspan>inter</tspan>after</text>
  <script>
    var alignmentBaselineValues = ["baseline", "central", "after-edge", "text-after-edge",
                                   "ideograpic", "alphabetic", "mathematical"];
    var expectedDeltas = {
        "baseline" : 0,
        "before-edge": -16,
        "text-before-edge": -16,
        "middle": -8,
        "central": -6,
        "after-edge": 4,
        "text-after-edge": 4,
        "ideograpic": 0,
        "alphabetic": 0,
        "hanging": -13,
        "mathematical": -8
    };

    var zoomLevels = [1, 4, 16];
    var html = document.documentElement;
    alignmentBaselineValues.forEach(function (alignmentBaselineValue) {
        document.querySelector('tspan').setAttribute('alignment-baseline', alignmentBaselineValue);
        zoomLevels.forEach(function (zoom) {
            html.style.zoom = zoom;
            var baselineShiftDelta = (document.querySelector('text').getStartPositionOfChar(0).y -
                document.querySelector('tspan').getStartPositionOfChar(0).y);
            test(function () {
                assert_approx_equals(baselineShiftDelta, expectedDeltas[alignmentBaselineValue], 1);
            }, "Text bounds height at zoom " + zoom + " with alignment-baseline=" + alignmentBaselineValue);
        });
    });
    html.style.zoom = 1;
    // Clean up to avoid being classified as a text test; avoids an -expected.txt file.
    document.querySelector('text').remove();
  </script>
</svg>
chromium/third_party/blink/web_tests/svg/custom/zoomed-alignment-baseline.html
