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<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.text.drawing.style.letterSpacing.change.font</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<h1>2d.text.drawing.style.letterSpacing.change.font</h1>
<p class="desc">Set letter spacing and word spacing to font dependent value and verify it works after font change.</p>
<script>
var t = async_test("Set letter spacing and word spacing to font dependent value and verify it works after font change.");
var t_pass = t.done.bind(t);
var t_fail = t.step_func(function(reason) {
throw reason;
});
t.step(function() {
var canvas = new OffscreenCanvas(100, 50);
var ctx = canvas.getContext('2d');
_assertSame(ctx.letterSpacing, '0px', "ctx.letterSpacing", "'0px'");
_assertSame(ctx.wordSpacing, '0px', "ctx.wordSpacing", "'0px'");
// Get the width for 'Hello World' at default size, 10px.
var width_normal = ctx.measureText('Hello World').width;
ctx.letterSpacing = '1em';
_assertSame(ctx.letterSpacing, '1em', "ctx.letterSpacing", "'1em'");
// 1em = 10px. Add 10px after each letter in "Hello World",
// makes it 110px longer.
var width_with_spacing = ctx.measureText('Hello World').width;
assert_approx_equals(width_with_spacing, width_normal + 110, 0.1, "letter-spacing error");
// Changing font to 20px. Without resetting the spacing, 1em letterSpacing
// is now 20px, so it's suppose to be 220px longer without any letterSpacing set.
ctx.font = '20px serif';
width_with_spacing = ctx.measureText('Hello World').width;
// Now calculate the reference spacing for "Hello World" with no spacing.
ctx.letterSpacing = '0em';
width_normal = ctx.measureText('Hello World').width;
assert_approx_equals(width_with_spacing, width_normal + 220, 0.1, "letter-spacing error after font change");
t.done();
});
</script>
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