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List:       webkit-dev
Subject:    Re: [webkit-dev] Lazy loading
From:       Simon Fraser <simon.fraser () apple ! com>
Date:       2019-10-28 19:02:32
Message-ID: A31609C8-66E4-4B93-8D6C-5B2D0C8FADCA () apple ! com
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> On Oct 28, 2019, at 11:39 AM, Rob Buis <rbuis@igalia.com> wrote:
> 
> Hi,
> 
> I made a lazy image loading prototype earlier this year \
> (https://bugs.webkit.org/show_bug.cgi?id=196698) and have been splitting it up into \
> reviewable patches. The main implementation part landed recently so I am wondering \
> about the next steps. 
> One thing left to do for sure is cleaning up/adding tests. For one there are tests \
> in http/tests/lazyload which can just be WPT tests, so I'll work in this area for \
> sure. As usual, while adding new tests bugs may show up and more patches will be \
> needed. 
> Another possible task is implementing metadata fetch, but it makes the code more \
> complex and chromium has backtracked from it. 
> Changing the behavior of loading=auto to make lazy loading the default seems risky \
> and should possibly only be done when lazy image loading is deemed stable enough.

Agreed. Is there any compat data from other browsers?

> 
> Yet another possible task is making lazy loading work for CSS backgrounds, this is \
> implemented in the prototype but I don't think there are many tests for it. 
> A related task is implementing lazy loading for iframe's, I took a quick look and \
> this looks like similar work to lazy image loading, but should be much easier to \
> implement now the building blocks are there.

I think this one has the highest potential to give big page loading gains, especially \
if we can get this one turned on by default (or maybe for cross-origin frames), so I \
suggest working on this.

Do we have any data from other browsers to know whether enabling lazy-loading iframe \
by default breaks the web?

> 
> Finally there is the task of setting threshold viewport distance values for \
> triggering deferred loads. I only have access to iOS simulator, so I wonder if that \
> is something Apple could help with?

I would be happy to help.

> 
> I do not have a strong preference among these tasks. Thoughts?
> Cheers,
> 
> Rob.
> 
> P.S: I intend to attend the WebKit Contributors meeting, so feel free to chat with \
> me there about lazy loading.

See you there!

Simon
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