Some Resource Timing Test Cases

Created to explore what Resource Timing information browsers provide in error cases.

Each case attempts to load a resource, then when onload fires it checks the PerfromanceEntries for that resource.

dns-failure.html	References an image from a domain that doesn't resolve
tcp-connection-failure.html	References an image from an IP that can't be connected to
http-404-failure.html	Referemces an image that doesn't exist
chrome-resource-timing-error.html	Redundant was created to reproduce an error in Chrome but other failures will produce it too

TODO

More test cases are needed for example:

• Original cases with cross-domain that has TAO header
• Mixed content
• CSP
• TLS negotiation failure

Bugs Raised

Chrome

Resource Timing - Missing PerformanceResourceTiming entries for Requests that don't receive a Response	https://code.google.com/p/chromium/issues/detail?id=460879
Resource Timing - Malformed HTML causes incorrect PerformanceEntry	https://code.google.com/p/chromium/issues/detail?id=464058

Firefox

Resource Timing API - responseEnd is before requestStart and responseStart for HTTP 404	https://bugzilla.mozilla.org/show_bug.cgi?id=1139831

Testing in WPT

If you want to check any of the cases in WPT set a custom metric so you can copy the values, or extract them via the API

For example:

[RT]
var url = document.getElementById("test-img");	
resourceEntries = window.performance.getEntriesByName(url.src);

return JSON.stringify(resourceEntries, null, 2);