html/rendering/widgets/field-sizing-input-text.html

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-ui-4/#field-sizing">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.disable-default {
  field-sizing: content;
}

.small-placeholder {
  font-size: 32px;
}
.small-placeholder::placeholder {
  font-size: 16px;
}

.large-placeholder {
  font-size: 20px;
}
.large-placeholder::placeholder {
  font-size: 40px;
}
</style>
<body>
<div id="container"></div>
<script>
const DISABLE = 'class="disable-default"';
const LONG_TEXT = 'The quick brown fox jumps over the lazy dog.';

function addElements(source) {
  const container = document.querySelector('#container');
  container.innerHTML = source + source;
  container.lastElementChild.classList.add('disable-default');
  return {
    fixed: container.firstElementChild,
    content: container.lastElementChild
  };
}

function addTwoElements(source1, source2) {
  const container = document.querySelector('#container');
  container.innerHTML = source1 + source2;
  return {
    e1: container.firstElementChild,
    e2: container.lastElementChild
  };
}

['text', 'search', 'tel', 'url', 'email', 'password'].forEach(type => {
  test(() => {
    let pair = addElements(`<input type=${type}>`);
    // A text <input> has approximately 20ch width by default.
    // A text <input> with field-sizing:content must be shorter than the default.
    assert_less_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
    assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);

    pair = addTwoElements(`<input type=${type} ${DISABLE}>`,
                          `<input type=${type} ${DISABLE} value="foo">`);
    assert_less_than(pair.e1.offsetWidth, pair.e2.offsetWidth);
    assert_equals(pair.e1.offsetHeight, pair.e2.offsetHeight);
  }, `${type}: Empty value`);

  test(() => {
    let pair = addElements(`<input type=${type} size="10">`);
    assert_less_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
    assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);
  }, `${type}: Empty value with a size atttribute`);

  test(() => {
    let pair = addElements(`<input type=${type} value="${LONG_TEXT}">`);
    assert_greater_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
    pair = addElements(`<input type=${type} placeholder="${LONG_TEXT}">`);
    assert_greater_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
  }, `${type}: Auto width and auto height with a long text`);

  test(() => {
    let pair = addElements(`<input type=${type} style="width:20ch; height:2lh">`);
    assert_equals(pair.content.offsetWidth, pair.fixed.offsetWidth);
    assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);

    pair = addElements(`<input type=${type} style="width:20ch; height:2lh" value="${LONG_TEXT}">`);
    assert_equals(pair.content.offsetWidth, pair.fixed.offsetWidth);
    assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);

    pair = addElements(`<input type=${type} style="width:20ch; height:2lh" placeholder="${LONG_TEXT}">`);
    assert_equals(pair.content.offsetWidth, pair.fixed.offsetWidth);
    assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);
  }, `${type}: Explicit width and heigth`);

  test(() => {
    let pair = addElements(`<input type=${type} style="width:20ch">`);
    assert_equals(pair.content.offsetWidth, pair.fixed.offsetWidth);
    assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);

    pair = addElements(`<input type=${type} style="width:20ch" value="${LONG_TEXT}">`);
    assert_equals(pair.content.offsetWidth, pair.fixed.offsetWidth);
    assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);

    pair = addElements(`<input type=${type} style="width:20ch" placeholder="${LONG_TEXT}">`);
    assert_equals(pair.content.offsetWidth, pair.fixed.offsetWidth);
    assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);
  }, `${type}: Explicit width and auto height`);

  test(() => {
    let pair = addElements(`<input type=${type} style="height:2lh">`);
    assert_less_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
    assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);

    pair = addElements(`<input type=${type} style="height:2lh" value="${LONG_TEXT}">`);
    assert_greater_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
    assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);

    pair = addElements(`<input type=${type} style="height:2lh" placeholder="${LONG_TEXT}">`);
    assert_greater_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
    assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);
  }, `${type}: Explicit height and auto width`);

  test(() => {
    let pair = addTwoElements(
        `<input type=${type} class="disable-default small-placeholder">`,
        `<input type=${type} class="disable-default small-placeholder" placeholder="foo bar">`);
    assert_less_than(pair.e1.offsetWidth, pair.e2.offsetWidth);
    assert_equals(pair.e1.offsetHeight, pair.e2.offsetHeight);
  }, `${type}: Text caret is taller than the placeholder`);

  test(() => {
    let pair = addTwoElements(
        `<input type=${type} class="disable-default large-placeholder">`,
        `<input type=${type} class="disable-default large-placeholder" placeholder="foo bar">`);
    assert_less_than(pair.e1.offsetWidth, pair.e2.offsetWidth);
    assert_less_than(pair.e1.offsetHeight, pair.e2.offsetHeight);

    pair = addTwoElements(
        `<input type=${type} class="disable-default" style="font-size:40px; padding:16px">`,
        `<input type=${type} class="disable-default large-placeholder"
                placeholder="foo bar" style="font-size:40px; padding:16px">`);
    assert_equals(pair.e1.offsetHeight, pair.e2.offsetHeight);
    assert_equals(pair.e1.offsetTop, pair.e2.offsetTop);
  }, `${type}: Text caret is shorter than the placeholder`);

  test(() => {
     const container = document.querySelector('#container');
     container.innerHTML = `<input type=${type}>`;
     const element = container.firstChild;
     const w = element.offsetWidth;
     const h = element.offsetHeight;
     element.classList.add('disable-default');
     assert_less_than(element.offsetWidth, w);
     assert_equals(element.offsetHeight, h);
  }, `${type}: Update field-sizing property dynamically`);

});
</script>
</body>