My two cents. I do not like the word "block" since it suggests block elements of HTML. But ruby elements are clearly in-line elements.

What does "ruby element" mean here? Do you mean the HTML <ruby> element?

Regarding the word "block", if it causes misunderstanding, what about changing it to "container" or "container box" as in CSS? See https://www.w3.org/TR/css-ruby-1/#ruby-container

notes for history and/or background

• since laying ruby in two steps was introduced in simple-ruby, no such definition in JLReq (e.g. run of ruby text associated with each base character or group of ruby text and base characters)
• currently (means before open PRs merged), only section 2.2 uses a term ruby block (= so, we can rephrase without using this term? - but I suppose we are better to have some terminology here as new two step handling)

@xfq Yes, I mean the HTML ruby element, but I now think that a ruby block is not an HTML ruby element.

I now think that "ruby blocks" are created by laying out base-ruby pairs without considering preceding or following characters. When line break occurs within a single interlinear note, two "ruby blocks" are created from a single interlinear note. So, I now think that a ruby box is probably the right word.

The same for me, at HTML element.

Consider following examples (contains rt/rb):

1. <ruby><rb>慶<rt>けい</ruby>
2. <ruby><rb>慶應義塾<rt>けいおうぎじゅく</ruby>
3. <ruby><rb>慶<rb>應<rb>義<rb>塾<rt>けい<rt>おう<rt>ぎ<rt>じゅく</ruby>
4. <ruby><rb>慶<rt>けい</ruby><ruby><rb>應<rt>おう</ruby><ruby><rb>義<rt>ぎ</ruby><ruby><rb>塾<rt>じゅく</ruby>

1 is clearly mono-ruby, 2 should be group-ruby, 3 should be jukugo-ruby. How about 4?

@himorin

<ruby><rb>慶<rb>應<rb>義<rb>塾<rt>けい<rt>おう<rt>ぎ<rt>じゅく</ruby>

This can be two ruby boxes if this ruby element does not fit in the current line.

<ruby><rb>慶<rb>應<rb>義<rb>塾<rt>けい<rt>おう<rt>ぎ<rt>じゅく</ruby>
This can be two ruby boxes if this ruby element does not fit in the current line.

Yes, and therefore this should be jukugo-ruby.

I then propose to reformulate the current definition:

we refer to the ruby annotation and its base text, collectively, as the ruby block.

Here is my proposal.

A ruby box is a box created by formatting a ruby element in the first layer. More than one ruby box may be created from a single ruby element when line breaks occur.

(I am very against the word "step"!!!!)

Moreover,

In the first step, processing of layout only considers the relative positions of the ruby annotation and its base text

in 2.2 should be changed

A ruby box is a box created by formatting a ruby element in the first layer. More than one ruby box may be created from a single ruby element when line breaks occur.

If we're going to use the term "ruby element" (which is not currently in the simple-ruby document), I suggest we define it as well. From what I understand, simple-ruby is technology-agnostic, and in addition to HTML, the "ruby element" concept is also present in languages such as TTML and WebVTT.