[webkit-help] How does mobile webkit's auto text resizing algorithm work?

Antonio Gomes tonikitoo at gmail.com
Thu Aug 16 12:08:54 PDT 2012

See https://bugs.webkit.org/show_bug.cgi?id=84186 and

John seems to be following the algorithm in the later.

On Wed, Aug 15, 2012 at 10:28 PM, Toby Ho <airportyh at gmail.com> wrote:

> Hello all,
> I am currently investigating how the auto text resizing on mobile
> webkit works, more specifically iOS. My end goal is to reverse
> engineer the algorithm using Javascript, so that I can on a desktop
> webkit browser mimic what it should look like on the device.
> My current approach is black box testing, but this has not been very
> fruitful as of yet: it seems I keep uncovering more layers of
> complexity. Here are some things I have found so far:
> 1. there's a correlation between the final font-size and the container's
> width
> 2. there's also a correlation with the length of text, for example, in
> one test, when the length of the paragraph cross the threshold ~165
> characters, the font size increases by 1 or 2 pxs
> 3. it also depends on the number of elements on the page that has
> text. For example, there's only one element on the entire page with
> text in it, then the auto resizing doesn't seem to kick in at all
> 4. when you have multiple elements on the page with text, the final
> font size seems to be determined by a combination of the widths and
> the lengths of the texts within all the elements
> If someone could give me more detail or guidance on how this algorithm
> works, or at least where to dig deeper, I'd greatly appreciate it.
> Thanks,
> Toby
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--Antonio Gomes
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