W3C home > Mailing lists > Public > public-tt@w3.org > December 2013

Re: Issue-286 padding

From: Glenn Adams <glenn@skynav.com>
Date: Thu, 19 Dec 2013 13:11:57 -0700
Message-ID: <CACQ=j+f1k9SSxBAJch-CNK6wrcFO-suXn3Wpg33Fs9b_64fb1w@mail.gmail.com>
To: Nigel Megitt <nigel.megitt@bbc.co.uk>
Cc: TTWG <public-tt@w3.org>
On Wed, Dec 4, 2013 at 9:11 AM, Nigel Megitt <nigel.megitt@bbc.co.uk> wrote:

>  Specifically on padding, the EBU discussed this requirement further last
> week and agreed that the requirement that foreground layout must not be
> affected can be relaxed: even though it's not the ideal solution it does
> have a safe fallback. This in turn permitted a revised requirement that
> should be easier to implement in CSS and can be expressed as a definition
> of tts:padding on <p>, which is currently not defined in TTML. The attached
> diagram explains the expected behaviour, i.e. that padding is applied to
> each rendered line and acts very much like a line-based version of region
> padding.
>
>  Note that this solution does not define <span> based padding which
> wouldn't really work here – the padding would interfere with intended
> spacing. However EBU does not have a requirement for this.
>

Actually, I don't agree that span based padding wouldn't work. It would
work if accompanied by box-decoration-break:clone. That is, the following
HTML excerpt would produce the results of your example while handling
different line breaks properly. The only problem is that I can't find a
browser that implements clone on padding. Opera implements clone on border
and shadow, but not on padding (yet) -- I've reported a bug.

<p><span style="background-color: #CCC; padding: 0px 20px;
box-decoration-break: clone; font-size: 64pt; font-family:
monospace;">Beware the Jubjub bird, and shun The frumious
Bandersnatch!</span></p>


>
>  Nigel
>
>   On 13/11/2013 16:07, "Glenn Adams" <glenn@skynav.com> wrote:
>
>   The attached shows the difference between putting the
> background/padding on span versus p. Take your pick.
>
>
>
> On Wed, Nov 13, 2013 at 12:15 PM, Nigel Megitt <nigel.megitt@bbc.co.uk>wrote:
>
>>  Thanks Glenn,
>>
>>  I'm not sure this meets the described rowPadding requirements - the
>> padding appears to be attached to the <p> not the rendered rows of text, so
>> if an automatic (i.e. not explicit) line break is inserted the padding
>> isn't added to the new rows. Is there a way to extend it to do that as well?
>>
>>  Nigel
>>
>>  ------------------------------
>> *From:* Glenn Adams [glenn@skynav.com]
>> *Sent:* 13 November 2013 03:03
>> *To:* TTWG
>> *Subject:* Re: row align and padding
>>
>>    Here's are two versions that work on Safari. For Safari 6.0.5 or
>> earlier, use the one labeled old syntax. For 6.1 and 7.0, use the other
>> (which uses new syntax). Safari still requires use of the "-webkit-" prefix
>> in both cases.
>>
>>
>> On Wed, Nov 13, 2013 at 5:09 AM, Glenn Adams <glenn@skynav.com> wrote:
>>
>>> Simplified and clean up example, using single <p> for each caption's
>>> text (instead of separate p per line).
>>>
>>>
>>> On Tue, Nov 12, 2013 at 5:56 PM, Glenn Adams <glenn@skynav.com> wrote:
>>>
>>>> The attached uses to CSS3 Flexbox and a few other properties to produce
>>>> the desired effects for the row align and padding examples I've seen. It
>>>> works on current versions of Chrome, Firefox, and Opera. It doesn't seem to
>>>> work on Safari 6.0.5. I haven't tested IE, but supposedly IE10 and
>>>> following supports Flexbox.
>>>>
>>>
>>>
>>
>>
>> ----------------------------
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>
>
>
> ----------------------------
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Received on Thursday, 19 December 2013 20:12:47 UTC

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