Simon Willison’s Weblog

quipt (via) Extremely clever idea: Cache JavaScript in window.name (which persists between page views and can hold several MB of data), but use document.referrer to check that an external domain hasn’t loaded the cache with malicious code for an XSS attack. UPDATE: Jesse Ruderman points out a fatal flaw in the comments. 4th July 2008, 3:49 pm

Faster JavaScript Trim. Neat optimisation post—it turns out that while regular expressions are great for removing leading whitespace you can do a lot better at trailing whitespace by manually looping backwards from the end of the string. 3rd February 2008, 10:12 pm

YSlow. New extension for Firebug (yes, an extension on top of another extension) from the Yahoo! performance team which provides improved performance measurement tools and optimisation advice. 25th July 2007, 4:48 am