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Re: [csswg-drafts] [css-text] Clarify how letter-spacing and word-spacing should affect tab-size.

From: fantasai via GitHub <sysbot+gh@w3.org>
Date: Tue, 03 Jan 2017 11:24:54 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-270095107-1483442692-sysbot+gh@w3.org>
Tabs are defined to be rendered as a shift in position, not as a 
grapheme affected by `letter-spacing` or `word-spacing`. 

>Each tab is rendered as a horizontal shift that lines up the start 
edge of the next glyph with the next tab stop. Tab stops occur at 
points that are multiples of the tab size from the block’s starting 
content edge.

I can clarify in `letter-spacing` that tabs are not affected, if that 
is a point of confusion.

dbaron wrote:
> I don't understand the motivation for accounting for word-spacing, 
so it's hard for me to tell what was intended. What is accounting for 
word-spacing supposed to make things line up with?

Spaces. Spaces are increased by `word-spacing`, so for tab stops to 
line up with multiples of spaces, they must account for the width of 
the space, plus `letter-spacing`, plus `word-spacing`.

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