css/css-fonts/font-shorthand-serialization-font-stretch.html

<!doctype html>
<meta charset="utf-8">
<title>CSS Test: font shorthand serialization with font-stretch values</title>
<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#propdef-font">
<link rel="help" href="https://drafts.csswg.org/cssom-1/#serializing-css-values">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="test" style="font: medium serif"></div>
<script>
test(function() {
    const div = document.getElementById("test");
    div.style.fontStretch = "ultra-condensed";
    assert_equals(div.style.fontStretch, "ultra-condensed");
    assert_equals(div.style.font, "ultra-condensed medium serif");
    div.style.fontStretch = "extra-condensed";
    assert_equals(div.style.fontStretch, "extra-condensed");
    assert_equals(div.style.font, "extra-condensed medium serif");
    div.style.fontStretch = "condensed";
    assert_equals(div.style.fontStretch, "condensed");
    assert_equals(div.style.font, "condensed medium serif");
    div.style.fontStretch = "semi-condensed";
    assert_equals(div.style.fontStretch, "semi-condensed");
    assert_equals(div.style.font, "semi-condensed medium serif");
    div.style.fontStretch = "normal";
    assert_equals(div.style.fontStretch, "normal");
    assert_equals(div.style.font, "medium serif", "The keyword normal should be omitted");
    div.style.fontStretch = "semi-expanded";
    assert_equals(div.style.fontStretch, "semi-expanded");
    assert_equals(div.style.font, "semi-expanded medium serif");
    div.style.fontStretch = "expanded";
    assert_equals(div.style.fontStretch, "expanded");
    assert_equals(div.style.font, "expanded medium serif");
    div.style.fontStretch = "extra-expanded";
    assert_equals(div.style.fontStretch, "extra-expanded");
    assert_equals(div.style.font, "extra-expanded medium serif");
    div.style.fontStretch = "ultra-expanded";
    assert_equals(div.style.fontStretch, "ultra-expanded");
    assert_equals(div.style.font, "ultra-expanded medium serif");
}, "Keywords should appear in serialization of font and fontStretch");

test(function() {
    const div = document.getElementById("test");
    div.style.fontStretch = "50%";
    assert_equals(div.style.fontStretch, "50%");
    assert_equals(div.style.font, "ultra-condensed medium serif");
    div.style.fontStretch = "62.5%";
    assert_equals(div.style.fontStretch, "62.5%");
    assert_equals(div.style.font, "extra-condensed medium serif");
    div.style.fontStretch = "75%";
    assert_equals(div.style.fontStretch, "75%");
    assert_equals(div.style.font, "condensed medium serif");
    div.style.fontStretch = "87.5%";
    assert_equals(div.style.fontStretch, "87.5%");
    assert_equals(div.style.font, "semi-condensed medium serif");
    div.style.fontStretch = "100%";
    assert_equals(div.style.fontStretch, "100%");
    assert_equals(div.style.font, "medium serif", "The keyword normal should be omitted");
    div.style.fontStretch = "112.5%";
    assert_equals(div.style.fontStretch, "112.5%");
    assert_equals(div.style.font, "semi-expanded medium serif");
    div.style.fontStretch = "125%";
    assert_equals(div.style.fontStretch, "125%");
    assert_equals(div.style.font, "expanded medium serif");
    div.style.fontStretch = "150%";
    assert_equals(div.style.fontStretch, "150%");
    assert_equals(div.style.font, "extra-expanded medium serif");
    div.style.fontStretch = "200%";
    assert_equals(div.style.fontStretch, "200%");
    assert_equals(div.style.font, "ultra-expanded medium serif");
    div.style.fontStretch = "50.00000%";
    assert_equals(div.style.fontStretch, "50%");
    assert_equals(div.style.font, "ultra-condensed medium serif");
}, "Percentages which can be transformed into keywords should be for serialization of font, but not of fontStretch");

test(function() {
    const div = document.getElementById("test");
    div.style.fontStretch = "25%";
    assert_equals(div.style.fontStretch, "25%");
    assert_equals(div.style.font, "");
    div.style.fontStretch = "101%";
    assert_equals(div.style.fontStretch, "101%");
    assert_equals(div.style.font, "");
    div.style.fontStretch = "50.01%";
    assert_equals(div.style.fontStretch, "50.01%");
    assert_equals(div.style.font, "");
}, "Percentages which cannot be transformed into keywords should prevent the font shorthand from serializing, but not fontStretch");

test(function() {
    const div = document.getElementById("test");

    // This isn't well-specified, but appears to be consistent across browsers.
    div.style.fontStretch = "calc(50%)";
    assert_equals(div.style.fontStretch, "calc(50%)");
    assert_equals(div.style.font, "ultra-condensed medium serif");

    div.style.fontStretch = "calc(50% + 25% * sign(100em - 1px))";
    assert_equals(div.style.fontStretch, "calc(50% + (25% * sign(100em - 1px)))");
    assert_equals(div.style.font, "");
}, "calc() transformation into keywords");

</script>