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<!DOCTYPE html>
<meta charset="utf-8">
<title>ScrollTimeline constructor</title>
<link rel="help" href="https://wicg.github.io/scroll-animations/#scrolltimeline-interface">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.scroller {
height: 100px;
width: 100px;
overflow: scroll;
}
.content {
height: 500px;
width: 500px;
}
</style>
<div class="scroller">
<div class="content"></div>
</div>
<script>
'use strict';
function formatOffset(v) {
if (typeof(v) == 'object')
return `${v.constructor.name}(${v.toString()})`;
return `'${v.toString()}'`;
}
function assert_offsets_equal(a, b) {
assert_equals(formatOffset(a), formatOffset(b));
}
// source
test(t => {
const scroller = document.querySelector('.scroller');
assert_equals(
new ScrollTimeline({source: scroller}).source, scroller);
}, 'A ScrollTimeline can be created with a source');
test(t => {
const div = document.createElement('div');
assert_equals(new ScrollTimeline({source: div}).source, div);
}, 'A ScrollTimeline can be created with a non-scrolling source');
test(t => {
assert_equals(new ScrollTimeline({source: null}).source, null);
}, 'A ScrollTimeline created with a null source should have no source');
test(t => {
assert_equals(new ScrollTimeline().source, document.scrollingElement);
}, 'A ScrollTimeline created without a source should use the ' +
'document.scrollingElement');
// axis
test(t => {
assert_equals(new ScrollTimeline().axis, 'block');
}, 'A ScrollTimeline created with the default axis should default to ' +
`'block'`);
const gValidAxisValues = [
'block',
'inline',
'x',
'y',
];
for (let axis of gValidAxisValues) {
test(function() {
const scrollTimeline =
new ScrollTimeline({axis: axis});
assert_equals(scrollTimeline.axis, axis);
}, `'${axis}' is a valid axis value`);
}
test(t => {
let constructorFunc = function() {
new ScrollTimeline({axis: 'nonsense'})
};
assert_throws_js(TypeError, constructorFunc);
// 'auto' for axis was previously in the spec, but was removed. Make
// sure that implementations do not support it.
constructorFunc = function() {
new ScrollTimeline({axis: 'auto'})
};
assert_throws_js(TypeError, constructorFunc);
}, 'Creating a ScrollTimeline with an invalid axis value should throw');
</script>
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