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decimal-points-in-numbers.html
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<!doctype html>
<title>decimal points in numbers</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<meta name=author title="Tab Atkins-Bittner">
<link rel=help href="https://drafts.csswg.org/css-syntax/#consume-number">
<style>
.foo {}
</style>
<script>
function roundTripNumber(input) {
const rule = document.styleSheets[0].cssRules[0].style;
const fallback = "0";
rule.setProperty("line-height", fallback);
rule.setProperty("line-height", input);
const value = rule.getPropertyValue("line-height");
if(value == fallback) return false;
return value;
}
test(()=>{
assert_equals(roundTripNumber("1.0"), "1");
}, "decimal point between digits is valid in a number");
test(()=>{
assert_equals(roundTripNumber(".1"), "0.1");
}, "decimal point before digits is valid in a number");
test(()=>{
assert_not_equals(roundTripNumber("1."), "1");
}, "decimal point after digits is invalid in a number");
function roundTripDimension(input) {
const rule = document.styleSheets[0].cssRules[0].style;
const fallback = "0px";
rule.setProperty("width", fallback);
rule.setProperty("width", input);
const value = rule.getPropertyValue("width");
if(value == fallback) return false;
return value;
}
test(()=>{
assert_equals(roundTripDimension("1.0px"), "1px");
}, "decimal point between digits is valid in a dimension");
test(()=>{
assert_equals(roundTripDimension(".1px"), "0.1px");
}, "decimal point before digits is valid in a dimension");
test(()=>{
assert_not_equals(roundTripDimension("1.px"), "1px");
}, "decimal point after digits is invalid in a dimension");
</script>