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chromium/third_party/blink/web_tests/transforms/scale-parsing.html 

<!DOCTYPE html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<div id="target" style="width: 100px; height: 200px; display: inline-block"></div>
<script src="resources/parsing-test-helper.js"></script>
<script>
expect = expect.bind(this, 'scale', 'scale');

expect('initial').parsesAs('initial').isComputedTo('none');
expect('inherit').parsesAs('inherit');

expect('none').parsesAs('none').isComputedTo('none');
expect('1').parsesAs('1').isComputedTo('1');
expect('5').parsesAs('5').isComputedTo('5');
expect('5 5').parsesAs('5').isComputedTo('5');
expect('1 -2.3').parsesAs('1 -2.3').isComputedTo('1 -2.3');
expect('1 -2.3 4').parsesAs('1 -2.3 4').isComputedTo('1 -2.3 4');
expect('30%').parsesAs('0.3').isComputedTo('0.3');

expect('calc(1 * 2)').parsesAs('2').isComputedTo('2');
expect('calc(1 * 2) calc(2 / 4)').parsesAs('2 0.5').isComputedTo('2 0.5');
expect('calc(1 * 2) calc(2 / 4) calc(0.5)').parsesAs('2 0.5 0.5').isComputedTo('2 0.5 0.5');
expect('calc(1 * 2) calc(2 / 4) calc(0.5%)').parsesAs('2 0.5 0.005').isComputedTo('2 0.5 0.005');

expect('2px').isInvalid();
expect('1 1 1 1').isInvalid();
expect('1 2 3deg').isInvalid();
expect('1 + 1').isInvalid();
expect('1,').isInvalid();
expect('1, 2,').isInvalid();
expect('calc(1 * 2 + 4px) calc(2 / 4) calc(0.5)').isInvalid();
expect('calc(1 * 2) calc(2 / 4 * 4deg) calc(0.5)').isInvalid();
</script>