On 8/31/17 1:24 PM, Gervase Markham wrote:
Have we changed the timeout recently regarding how long Firefox waits
for a stylesheet before rendering the page?
We do not have such a timeout at all. Our wait is fairly deterministic.
We start layout as soon as:
A) Script requests layout information
or
B) We have seen <body> and all stylesheets whose loads started due to
the parser inserting <link> elements are done loading. (Note that this
means we always wait for the <link> elements in <head>, and may wait for
the ones in <body>, depending on whether we manage to start their loads
before the ones from <head> finish loading.)
The symptoms you observe sound like (A) is happening, possible from an
extension or our browser UI... If you have a link to a specific url
that reproduces for you, especially in a clean profile, that would be
pretty useful. This is usually pretty simple to debug when (A) happens:
set a breakpoint on when we start layout and see what the JS stack is.
The hard part is catching it happening.
-Boris
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