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<!doctype html>
<title>VTTRegion()</title>
<link rel="help" href="https://w3c.github.io/webvtt/#dom-vttregion-vttregion">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
test(function() {
var region = new VTTRegion();
assert_true(region instanceof VTTRegion, "instanceof");
assert_equals(region.scroll, "");
assert_equals(region.viewportAnchorX, 0);
assert_equals(region.viewportAnchorY, 100);
assert_equals(region.regionAnchorX, 0);
assert_equals(region.regionAnchorY, 100);
assert_equals(region.lines, 3);
assert_equals(region.width, 100);
}, document.title + " initial values");
test(function() {
var region = new VTTRegion();
region.scroll = "invalid-scroll-value";
assert_equals(region.scroll, "");
checkValues([-1, 101], "IndexSizeError");
checkValues([-Infinity, Infinity, NaN], TypeError);
function assert_throws_something(error, func) {
if (typeof error == "string") {
assert_throws_dom(error, func);
} else {
assert_throws_js(error, func);
}
}
function checkValues(invalidValues, exception) {
for (var value of invalidValues) {
assert_throws_something(exception, function() { region.viewportAnchorX = value; });
assert_equals(region.viewportAnchorX, 0);
assert_throws_something(exception, function() { region.viewportAnchorY = value; });
assert_equals(region.viewportAnchorY, 100);
assert_throws_something(exception, function() { region.regionAnchorX = value; });
assert_equals(region.regionAnchorX, 0);
assert_throws_something(exception, function() { region.regionAnchorY = value; });
assert_equals(region.regionAnchorY, 100);
assert_throws_something(exception, function() { region.width = value; });
assert_equals(region.width, 100);
}
}
assert_equals(region.lines, 3);
region.lines = 130;
assert_equals(region.lines, 130);
region.viewportAnchorX = 64;
assert_equals(region.viewportAnchorX, 64);
region.viewportAnchorY = 32;
assert_equals(region.viewportAnchorY, 32);
region.regionAnchorX = 16;
assert_equals(region.regionAnchorX, 16);
region.regionAnchorY = 8;
assert_equals(region.regionAnchorY, 8);
region.width = 42;
assert_equals(region.width, 42);
}, document.title + " mutations");
</script>
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