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[css3-flexbox][css3-align] "Safe" or "true" centering by default

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Wed, 16 May 2012 17:27:40 -0700
Message-ID: <CAAWBYDD7vYwcE049vRVRAjxF1fPtm-UuF6HfOv1hbY4sCJb57Q@mail.gmail.com>
To: www-style list <www-style@w3.org>
Issue link: http://wiki.csswg.org/topics/css3-flexbox-true-safe-centering

Existing centering methods, such as using auto margins or the
'text-align' property, use “safe” centering - if an object is wider
than the container, it stops centering, and instead start/before
aligns. This helps ensure that content doesn't accidentally fall off
into an unscrollable area past the top/left edge of the screen.

Safe centering is “safe”, and common. However, there are good
use-cases for “true” centering, which continues to properly center an
item even if it's larger than the container. Which one should we
default to? Should we make it possible to opt into the other, and how?

A. (Current draft) “Safe” center by default. Authors can opt into true
centering by adding the “true” keyword alongside their alignment
value.
B. “True” center by default. Authors can opt into safe centering by
adding the “safe” keyword alongside their alignment value.

Thoughts?  I'm fine with what's in the draft currently, the (A) proposal.

~TJ
Received on Thursday, 17 May 2012 00:28:29 GMT

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