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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Fonts Module Level 4: parsing font with valid values</title>
<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#font-prop">
<meta name="assert" content="font supports the full grammar '[ [ <'font-style'> || <font-variant-css2> || <'font-weight'> || <font-stretch-css3> ]? <'font-size'> [ / <'line-height'> ]? <'font-family'> ] | caption | icon | menu | message-box | small-caption | status-bar'.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
</head>
<body>
<div id="target"></div>
<script>
'use strict';
// Firefox and Edge 18 serialize these as supplied.
// Blink and Safari have implementation-dependent or platform-dependent serializations.
function test_system_font(keyword) {
test(() => {
const target = document.getElementById('target');
const previousValue = 'italic xx-large/0px fantasy';
target.style.font = previousValue;
target.style.font = keyword;
const readValue = target.style.getPropertyValue('font');
assert_not_equals(readValue, '', 'font should be set');
assert_not_equals(readValue, previousValue, 'font should be updated');
target.style.font = previousValue;
target.style.font = readValue;
assert_equals(target.style.getPropertyValue('font'), readValue, "serialization should round-trip");
}, keyword + ' should be a supported system font.');
}
test_system_font('caption');
test_system_font('icon');
test_system_font('menu');
test_system_font('message-box');
test_system_font('small-caption');
test_system_font('status-bar');
// values other than normal
const generate_style = (() => {
const alternatives = [
'italic',
'oblique'
];
let counter = 0;
return () => alternatives[counter++ % alternatives.length];
})();
// value other than normal
const generate_variant = () => 'small-caps';
// values other than normal
const generate_weight = (() => {
const alternatives = [
'bold',
'bolder',
'lighter',
'100',
'900'
];
let counter = 0;
return () => alternatives[counter++ % alternatives.length];
})();
// values other than normal
const generate_stretch = (() => {
const alternatives = [
'ultra-condensed',
'extra-condensed',
'condensed',
'semi-condensed',
'semi-expanded',
'expanded',
'extra-expanded',
'ultra-expanded'
];
let counter = 0;
return () => alternatives[counter++ % alternatives.length];
})();
const generate_size = (() => {
const alternatives = [
// <absolute-size>
'xx-small',
'medium',
'xx-large',
// <relative-size>
'larger',
'smaller',
// <length-percentage>
'10px',
'20%',
'calc(30% - 40px)',
];
let counter = 0;
return () => alternatives[counter++ % alternatives.length];
})();
const generate_line_height = (() => {
const alternatives = [
null,
'normal',
'1.2',
'calc(120% + 1.2em)'
];
let counter = 0;
return () => alternatives[counter++ % alternatives.length];
})();
const generate_family = (() => {
const alternatives = [
'serif',
'sans-serif',
'cursive',
'fantasy',
'monospace',
'Menu',
'"FB Armada"'
];
let counter = 0;
return () => alternatives[counter++ % alternatives.length];
})();
function test_specific(prefix) {
let parts = [];
let canonical = [];
let style = null;
let variant = null;
let weight = null;
let stretch = null;
for (let entry of prefix) {
if (entry === 'style') {
style = generate_style();
parts.push(style);
} else if (entry === 'variant') {
variant = generate_variant();
parts.push(variant);
} else if (entry === 'weight') {
weight = generate_weight();
parts.push(weight);
} else if (entry === 'stretch') {
stretch = generate_stretch();
parts.push(stretch);
} else {
// normal
parts.push('normal');
}
}
if (style)
canonical.push(style);
if (variant)
canonical.push(variant);
if (weight)
canonical.push(weight);
if (stretch)
canonical.push(stretch);
const size = generate_size();
const lineHeight = generate_line_height();
if (lineHeight) {
parts.push(size + '/' + lineHeight);
if (lineHeight === 'normal')
canonical.push(size);
else
canonical.push(size + ' / ' + lineHeight);
} else {
parts.push(size);
canonical.push(size);
}
const family = generate_family();
parts.push(family);
canonical.push(family);
test_valid_value('font', parts.join(' '), canonical.join(' '));
}
function test_various(prefix) {
test_specific(prefix);
if (prefix.length === 4)
return;
const alternatives = [
'normal',
'style',
'variant',
'weight',
'stretch'
];
for (let alternative of alternatives) {
if (alternative === 'normal' || !prefix.includes(alternative))
test_various(prefix.concat(alternative));
// else we would have two styles or two variants, etc.
}
}
test_various([]);
</script>
</body>
</html>
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