<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-ruby/#line-height">
<link rel="stylesheet" href="/fonts/ahem.css">
<style>
body {
  font: 16px/1 Ahem;
}

body > div {
  border: 1px solid lime;
}

.over_emp {
  -webkit-text-emphasis: 'x';
  -webkit-text-emphasis-position: over left;
  text-emphasis: 'x';
  text-emphasis-position: over left;
}

.under_emp {
  -webkit-text-emphasis: 'x';
  -webkit-text-emphasis-position: under left;
  text-emphasis: 'x';
  text-emphasis-position: under left;
}
</style>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function renderRuby(source) {
  document.body.insertAdjacentHTML('afterbegin', source);
  const firstChild = document.body.firstChild;
  const container = firstChild.tagName == 'RUBY' ? null : firstChild;
  const ruby = firstChild.tagName == 'RUBY' ? firstChild : firstChild.querySelector('ruby');
  return {container: container, ruby: ruby, rt: ruby.querySelector('rt')}
}

function renderRubyAndGetBoxes(source) {
  const {container, ruby, rt} = renderRuby(source);
  return {
      container: container ? container.getBoundingClientRect() : null,
      ruby: ruby ? ruby.getBoundingClientRect() : null,
      rt: rt ? rt.getBoundingClientRect() : null
  };
}

test(() => {
  const {container, ruby, rt} = renderRubyAndGetBoxes(
      '<div><ruby>base<rt>annotation</rt></ruby></div>');
  assert_true(container.top <= rt.top);
  assert_true(rt.top < ruby.top);
}, 'Over ruby doesn\'t overflow the block');

test(() => {
  const {container, ruby, rt} = renderRubyAndGetBoxes(
      '<div>before <span style="vertical-align:32px;">' +
      '<ruby>base<rt>annotation</rt></ruby>' +
       '</span> after</div>');
  assert_true(container.top <= rt.top);
  assert_true(rt.top < ruby.top);
}, 'Over ruby + vertical-align doesn\'t overflow the block');

test(() => {
  const {container, ruby, rt} = renderRubyAndGetBoxes(
      '<div><ruby style="ruby-position:under">base<rt>annotation</rt></ruby></div>');
  assert_true(container.bottom >= rt.bottom);
  assert_true(rt.bottom > ruby.bottom);
}, 'Under ruby doesn\'t overflow the block');

test(() => {
  const {container, ruby, rt} = renderRubyAndGetBoxes(
      '<div>before <ruby style="vertical-align:-32px; ruby-position:under">' +
      'base<rt>annotation</rt></ruby> after</div>');
  assert_true(container.bottom >= rt.bottom);
  assert_true(rt.bottom > ruby.bottom);
}, 'Under ruby + vertical-align doesn\'t overflow the block');

test(() => {
  const {container, ruby, rt} = renderRuby(
      '<div><ruby style="ruby-position:under">base<rt>annotation</rt></ruby>' +
      '<div>n</div></div>');
  const nextBlockBox = container.querySelector('div').getBoundingClientRect();
  const rtBox = rt.getBoundingClientRect();
  assert_greater_than_equal(nextBlockBox.top, rtBox.bottom);
}, 'Under ruby doesn\'t overwrap with the next block');

test(() => {
  const {container, ruby, rt} = renderRuby(
      '<div><span>before</span><br><ruby>base<rt style="font-size:16px"' +
      '>annotation</rt></ruby></div>');
  const firstLine = container.querySelector('span').getBoundingClientRect();
  assert_true(ruby.getBoundingClientRect().top - firstLine.bottom > 1);
}, 'Expand inter-lines spacing');

test(() => {
  const {container, ruby, rt} = renderRuby(
      '<div style="line-height:1.5;">' +
      '<span>First line</span><br>' +
      '<span>Second line</span><br>' +
      '<ruby>base<rt style="font-size:50%">' +
      'annotation</rt></ruby></div>');
  const firstLine = container.querySelector('span').getBoundingClientRect();
  const secondLine = container.querySelectorAll('span')[1].getBoundingClientRect();
  const rubyLine = ruby.getBoundingClientRect();
  assert_approx_equals(secondLine.top - firstLine.top, rubyLine.top - secondLine.top, 1);
}, 'Consume half-leading of the previous line');

test(() => {
  const {container, ruby, rt} = renderRuby(
      '<div style="line-height:1.5;">' +
      '<span>First line</span><br>' +
      '<span class="under_emp">Second line</span><br>' +
      '<ruby>base<rt style="font-size:50%">' +
      'annotation</rt></ruby></div>');
  const firstLine = container.querySelector('span').getBoundingClientRect();
  const secondLine = container.querySelectorAll('span')[1].getBoundingClientRect();
  const rubyLine = ruby.getBoundingClientRect();
  const RUBY_EMPHASIS_SIZE = 8;
  assert_greater_than_equal(rubyLine.top - secondLine.top,
                            secondLine.top - firstLine.top + RUBY_EMPHASIS_SIZE);
}, 'Don\'t Consume half-leading of the previous line with text-emphasis');

test(() => {
  const {container, ruby, rt} = renderRuby(
      '<div style="line-height:1.5;">' +
      '<span>First line</span><br>' +
      '<ruby style="ruby-position:under">base<rt style="font-size:50%">' +
      'annotation</rt></ruby><br>' +
      '<span>Third line</span></div>');
  const firstLine = container.querySelector('span').getBoundingClientRect();
  const rubyLine = ruby.getBoundingClientRect();
  const thirdLine = container.querySelectorAll('span')[1].getBoundingClientRect();
  assert_approx_equals(rubyLine.top - firstLine.top, thirdLine.top - rubyLine.top, 1);
}, 'Consume half-leading of the next line');

test(() => {
  const {container, ruby, rt} = renderRuby(
      '<div style="line-height:1.5;">' +
      '<span>First line</span><br>' +
      '<ruby style="ruby-position:under">base<rt style="font-size:50%">' +
      'annotation</rt></ruby><br>' +
      '<span class="over_emp">Third line</span>' +
      '</div>');
  const firstLine = container.querySelector('span').getBoundingClientRect();
  const rubyLine = ruby.getBoundingClientRect();
  const thirdLine = container.querySelectorAll('span')[1].getBoundingClientRect();
  const RUBY_EMPHASIS_SIZE = 8;
  assert_greater_than_equal(thirdLine.top - rubyLine.top,
                            rubyLine.top - firstLine.top + RUBY_EMPHASIS_SIZE);
}, 'Don\'t Consume half-leading of the next line with text-emphasis');
</script>
</body>