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[css-ruby-1] Add diagrams for ruby-merge
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‎css-ruby-1/Overview.bs

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@@ -1352,6 +1352,19 @@ Sharing Annotation Space: the 'ruby-merge' property</h3>
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i.e. without overlapping adjacent bases on either side.
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This style is called “mono ruby” in [[JLREQ]].
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<figure>
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<img src="images/ruby-mono.png"
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alt="Extra space is added to base or annotations
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when one of the pair is longer than the other
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in order to keep each annotation exclusive to its own base.
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For example, in the annotation for “上手”,
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extra space is added around the first character
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to accommodate its longer annotation “じょう”
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while the shorter annotation “ず” for the second character
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is simply positioned and aligned with respect to its base characters.">
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<figcaption>''ruby-merge: separate'' with center alignment</figcaption>
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</figure>
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<div class="example">
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For example, the following two lines render the same:
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<pre highlight=html>
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This style renders similar to “group ruby” in [[JLREQ]],
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except that [=ruby annotations=] are kept together with their respective [=ruby bases=] when breaking lines.
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<figure>
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<img src="images/ruby-merge.png"
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alt="The combined annotation is centered with respect to the combined base,
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even if this would place an annotation’s content over a different base.
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In the case of “上手”, the “う” from the first base’s annotation
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and the “ず” from the second base’s annotation end up
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sharing space over the second base.">
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<figcaption>''ruby-merge: separate'' with center alignment</figcaption>
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</figure>
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<div class="example">
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The following two lines render the same
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if both characters fit on one line:
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the space is shared in some way
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to avoid imposing space between bases.
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<figure>
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<img src="images/ruby-jukugo.png"
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alt="If there is enough space, annotations are aligned to their bases;
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but if there is not, then annotations can share space with adjacent annotations.
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Thus the annotations for “上手”　share space over the second base as in the 'merge' case,
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but the annotations for “下手” which are one character each
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end up rendering as for 'separate'.">
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<figcaption>''ruby-merge: separate'' with center alignment</figcaption>
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</figure>
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<div class="note">
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Note: This behavior is intended for compound words,
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see <a href="https://www.w3.org/International/questions/qa-ruby#jukugo">“Jukugo Ruby” in “What is ruby?”</a>. [[QA-RUBY]]

‎css-ruby-1/images/ruby-jukugo.html

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<!DOCTYPE html mobile>
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<meta charset=utf-8>
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<style>
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body { font: 18px/1 Source Han Sans HW; text-align: center; display: flex; }
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hr { margin: 0 1em; border: dashed silver 1px; }
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body > .ruby { display: grid; grid-template-columns: auto auto; }
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.ruby > * { display: flex; justify-content: center; }
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.rb > i { flex: 1; }
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.rb { font-size: 200%; }
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.A { color: orange; }
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i { font: inherit; border: solid 1px silver; margin: -0.5px; }
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</style>
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<div class=ruby>
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<div class="rb"><i class=A>上</i><i class=B>手</i></div>
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<div class="rt" style="grid-row: 2"><i class=A>じ</i><i class=A>ょ</i><i class=A>う</i><i class=B>ず</i></div>
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</div>
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<hr>
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<div class=ruby>
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<div class="rb A"><i>下</i></div>
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<div class="rb B"><i>手</i></div>
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<div class="rt A"><i>へ</i></div>
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<div class="rt B"><i>た</i></div>
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</div>

‎css-ruby-1/images/ruby-jukugo.png

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‎css-ruby-1/images/ruby-merge.html

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<!DOCTYPE html mobile>
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<meta charset=utf-8>
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<style>
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body { font: 18px/1 Source Han Sans HW; text-align: center; display: flex; }
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hr { margin: 0 1em; border: dashed silver 1px; }
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body > .ruby { display: grid; grid-template-columns: auto auto; }
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.ruby > * { display: flex; justify-content: center; }
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.rb { font-size: 200%; }
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.A { color: orange; }
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i { font: inherit; border: solid 1px silver; margin: -0.5px; }
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</style>
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<div class=ruby>
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<div class="rb"><i class=A>上</i><i class=B>手</i></div>
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<div class="rt" style="grid-row: 2"><i class=A>じ</i><i class=A>ょ</i><i class=A>う</i><i class=B>ず</i></div>
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</div>
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<hr>
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<div class=ruby>
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<div class="rb"><i class=A>下</i><i class=B>手</i></div>
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<div class="rt" style="grid-row: 2"><i class=A>へ</i><i class=B>た</i></div>
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</div>

‎css-ruby-1/images/ruby-merge.png

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‎css-ruby-1/images/ruby-mono.html

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<!DOCTYPE html>
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<style>
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body { font: 18px/1 Source Han Sans HW; text-align: center; display: flex; }
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hr { margin: 0 1em; border: dashed silver 1px; }
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body > .ruby { display: grid; grid-template-columns: auto auto; }
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.ruby > * { display: flex; justify-content: center; }
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.rb { font-size: 200%; }
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.A { color: orange; }
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i { font: inherit; border: solid 1px silver; margin: -0.5px; }
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</style>
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<div class=ruby>
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<div class="rb A"><i>上</i></div>
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<div class="rb B"><i>手</i></div>
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<div class="rt A"><i>じ</i><i>ょ</i><i>う</i></div>
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<div class="rt B"><i>ず</i></div>
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</div>
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<hr>
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<div class=ruby>
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<div class="rb A"><i>下</i></div>
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<div class="rb B"><i>手</i></div>
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<div class="rt A"><i>へ</i></div>
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<div class="rt B"><i>た</i></div>
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</div>

‎css-ruby-1/images/ruby-mono.png

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