[webkit-dev] localStorage quota limit

Darin Fisher darin at chromium.org
Wed Dec 2 09:49:10 PST 2009

This would probably be a performance win since it would reduce the amount of
disk i/o.

(Note, it doesn't mean that 5 million characters could be stored since a
UTF-8 character might be multi-byte.)


On Wed, Dec 2, 2009 at 9:30 AM, Michael Nordman <michaeln at google.com> wrote:

> Could WebKit configure the localstorage database(s) to use UTF8 text
> encoding for string values?
> On Sun, Nov 29, 2009 at 8:38 AM, William Edney <
> bedney at technicalpursuit.com> wrote:
>> All -
>> I've been discussing the localStorage quota limit over on this bug with
>> Jeremy Orlow:
>> https://bugs.webkit.org/show_bug.cgi?id=31791
>> To recap from the discussions on that bug:
>> Jeremy has implemented the localStorage quota on the latest Webkit builds.
>> This caused my usage of localStorage to fail, because as a JS programmer, I
>> assumed that 5MB meant '5 million characters' of storage. This assumption
>> holds true on Firefox 3.5.X+ and IE8, but fails on Webkit since it stores
>> things into localStorage as UTF-16.
>> One option we discussed on that bug was getting the spec folks to alter
>> the spec in one of three ways:
>> - specify the quota in terms of 'characters' (or Strings, or whatever)
>> thereby abstracting away the encoding problem entirely.
>> - specify UTF-8 so that 'MB = characters'
>> - specify a JS API such that the encoding could be specified.
>> Jeremy wasn't too taken with any of these proposals, and in any case, they
>> probably need to be taken up on the W3 group defining this stuff, not here.
>> In any case, as Jeremy states in Comment #5 of the bug report, "the spec's
>> mentioning of 5mb is really just an example". And when I filed this bug on
>> Mozilla's Bugzilla tracker:
>> https://bugzilla.mozilla.org/show_bug.cgi?id=461684
>> another comment there points out the same thing. (Note that this bug was
>> originally filed to see if the Mozilla guys would raise their quota to 10MB
>> to match IE8 and, since they don't use double-byte encoding, I was really
>> asking for '10 million characters' there :-)).
>> Given that, an increase from 5MB to 10MB would 'solve my immediate
>> problem'. And, without going back to the spec folks, I'm not sure that much
>> more can be done here.
>> Jeremy wanted me to post to get the discussion started (and hopefully
>> attain some consensus :-) ), so let's discuss :-).
>> Thanks in advance!
>> Cheers,
>> - Bill
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