https://bugzilla.wikimedia.org/show_bug.cgi?id=49145
Web browser: ---
Bug ID: 49145
Summary: srcset implementation Galaxy S3 download issues
Product: Wikimedia
Version: wmf-deployment
Hardware: Smartphone
OS: other
Status: UNCONFIRMED
Severity: normal
Priority: Unprioritized
Component: General/Unknown
Assignee: [email protected]
Reporter: [email protected]
Classification: Unclassified
Mobile Platform: ---
An academic paper was released yesterday that gained quite a bit of press
because it asserted that the Samsung Galaxy S3 browser had a bug in it that
caused it to download much more data that it should.
Original paper:
http://lass.cs.umass.edu/papers/pdf/mbenchlab_iwqos13.pdf
Sample news coverage:
http://classic.slashdot.org/story/13/05/31/2312239
I believe the authors of the report erroneously concluded that this is a bug
with Samsung's browser and it is instead a bug in WikiMedia's implementation of
the srcset syntax.
The authors wrote:
"By looking at the recorded HTML page source, we saw that Wikipedia pages use
srcset HTML tags that indicate a list of images to pick from depending on the
resolution and magnification needed by the device. It turns out that the S3
browser has a bug and systematically downloads all images in a srcset instead
of picking only the one it needs (left most red circles on Fig. 14 show 3
different versions of the same image being downloaded). This can result in a
massive amount of extra data download."
But that conclusion is likely incorrect because:
1. WebKit has yet to implement srcset
<https://bugs.webkit.org/show_bug.cgi?id=110252>
2. Wikimedia has its own polyfill version of the jQuery HiDPI plugin that
actually handles srcset, not anything the browser is doing
<https://github.com/wikimedia/mediawiki-core/commit/966cda2f802cd6cf08d9b73f75fc4b0e7beab625>
I've contacted the authors to determine if they saw anything specifically that
indicated that this was a Samsung bug. But it seems most likely this is a
problem with the polyfill which is why I decided to submit a bug here as well.
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