[webkit-dev] spamming the developer console

[Ojan Vafai]

The amount of spam we throw in the developer console has grown quite a bit.

spam == things logged to the console that web developers have no control
over

Unlike uncaught javascript exceptions (which can easily just be caught),
there is no way to prevent the following from cluttering your console:
-clientX/clientY deprecation warning
-setting the fragment on a frame URL [1]
-loading a resource disallowed by CSP
-attempting to load a resource (e.g. in an image or iframe) that doesn't
exist

These warnings are not developer friendly. The equivalent would be to have
compiler warnings that you are unable to turn off. It clutters the console
and makes many console use-cases harder (e.g. console.log style debugging).
We need a better solution.

In many cases, these warnings don't actually represent bugs in the program
(e.g. the are legit reasons to try to load a non-existent resource in an
image element).

Some potential solutions:
1. Create a new loggling level (browserwarnings?) in addition to the
current errors/warnings/logs. This kind of half-solves the problem since
you can't just side these logs.
2. Have preventDefault in an onError handler prevent logging these to the
console (works for the navigation warnings).
3. Have some other inspector panel where these get logged.
4. Have some window-level state that disables all these sorts of warnings
(or something more fine-grained like being able to disable deprecation
warnings and navigation warnings separately).
5. ???

My preference would be to do both options 1 and 2 (they're not mutually
exclusive), unless someone has a better suggestion.

Ojan
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