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Re: [css-text] Collapsing whitespace at the end of a line

From: fantasai <fantasai.lists@inkedblade.net>
Date: Sat, 7 Jan 2017 23:21:09 -0500
To: "Tab Atkins Jr." <jackalmage@gmail.com>
Cc: www-style list <www-style@w3.org>
Message-ID: <ad464c94-ba70-3eec-b385-004e56abf9db@inkedblade.net>
On 08/19/2016 07:23 PM, Tab Atkins Jr. wrote:
> On Wed, Aug 17, 2016 at 7:19 PM, fantasai <fantasai.lists@inkedblade.net> wrote:
>> On 09/10/2015 01:36 PM, Tab Atkins Jr. wrote:
>>>
>>> According to <https://drafts.csswg.org/css-text/#collapse>, whitespace
>>> preceding a segment break is removed.  However, it appears that
>>> browsers instead collapse it to one space.
>>>
>>> Here's an example using 'white-space':
>>>
>>> <div style="white-space: pre-line;">a
>>> z</div>
>>>
>>> (Just in case the email client trims things, there's a space at the
>>> end of the first line, after the "a".)
>>>
>>> Here's an example using <br>:
>>>
>>> <div style="white-space: pre-line;">a <br>z</div>
>>>
>>> In both of these examples, if you highlight the "a" and then drag
>>> slightly rightward, you'll see it highlight a space character as well.
>>> This happens in both Chrome and Firefox.
>>>
>>> This sgugests that browsers are not following the "preceding" part of
>>> step 1 in that section, and are instead falling down to step 4, where
>>> runs of spaces are collapsed down to a single visible space.
>>>
>>> Is there a particular reason for this?  Should we adjust the spec to
>>> match implementations, or file bugs on implementations to match the
>>> spec?
>>
>> I'm inclined to file bugs on implementations to match the spec,
>> since that seems like kinda weird behavior. Why preserve the
>> space before the break but not after it? o_O
>
> I don't particularly care either way, tho there are cases where
> trailing whitespace has some significance - for example, illustrating
> markdown examples (where two trailing spaces indicates a hard
> linebreak).

Well, sure, but wouldn't you want pre-wrap for those kinds of cases?

[Testcase attached, fwiw.]

~fantasai

Received on Monday, 9 January 2017 18:07:59 UTC

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