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[csswg-drafts] [css-inline] Sizing problem with initial-letter-wrap: grid

From: Florian Rivoal via GitHub <sysbot+gh@w3.org>
Date: Tue, 17 Jan 2017 01:38:46 +0000
To: public-css-archive@w3.org
Message-ID: <issues.opened-201154956-1484617125-sysbot+gh@w3.org>
frivoal has just created a new issue for 
https://github.com/w3c/csswg-drafts:

== [css-inline] Sizing problem with initial-letter-wrap: grid ==
https://drafts.csswg.org/css-inline/#initial-letter-wrapping says:

> The rule for matching the character grid is 1ch × n + letter-spacing
 × (n - 1), where n is the size of the initial letter as specified by 
the initial-letter property.

This seems wrong on two accounts:

* This value is meant for CJK uses. The `ic` unit is the relevant one,
 not the `ch` unit. If we want to support aligning to a grid for latin
 monospaced fonts, we could make this depend on 
`initial-letter-align`, and use `ic` when it is set to `ideographic` 
and `ch` when it is set to `alphabetic`, but I am not sure it is worth
 doing, as Initial letters on monospaced latin text seems unusual.

* `n` shouldn't be the size of the initial letter as specified by the 
initial-letter property. That would result in a too small exclusion 
area when the line gap is large (or when the initial-letter text is 
long).

Here's an example of `initial-letter: 2` with a large line gap in 
vertical text. Each `[ ]` represents a `1ic` square.
```
[ ]   ____|____
[ ]   ' _____ '
[ ]         /
[ ]        /
[ ]    ---+---
[ ]       |
[ ]       |
[ ]       ’
[ ]   [ ]   [ ]
[ ]   [ ]   [ ]
[ ]   [ ]   [ ]
[ ]   [ ]   [ ]
```
Here, the exclusion area needs to be `8ic + 7 × letter-spacing`, not 
`2ic + 1 × letter-spacing`.


I suggest replacing that sentence with something like this:

> The size of the exclusion area in the inline direction must be `1ic 
× n + letter-spacing × (n - 1)` where n is the smallest integer for 
which the exclusion area is equal or larger than the advance measure 
of the initial letter.

Please view or discuss this issue at 
https://github.com/w3c/csswg-drafts/issues/947 using your GitHub 
account
Received on Tuesday, 17 January 2017 01:38:52 UTC

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