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Browserscope

Browserscope. O'Reilly Velocity OLC Dec 8, 2009. www.browserscope.org. Browserscope. Open-source, community-driven project for profiling browsers, launched Sept. 2009 Goals: foster browser innovation be a resource for web developers Based on UA Profiler. results since september.

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Browserscope

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  1. Browserscope O'Reilly Velocity OLC Dec 8, 2009

  2. www.browserscope.org

  3. Browserscope • Open-source, community-driven project for profiling browsers, launched Sept. 2009 • Goals: • foster browser innovation • be a resource for web developers • Based on UA Profiler

  4. results since september Security:  5085 tests on 169 browsers Rich Text:  11440 tests on 295 browsers Selectors API:  10988 tests on 291 browsers Network:  32235 tests on 627 browsers Acid3:  12139 tests on 290 browsers   71,887 tests total!

  5. new UI features • Compare Browsers! • Filter by Browser Family! • View results on a Line Chart!

  6. upcoming categories • Cookies (Eric Lovett) • Quirksmode DOM tests (PPK + Annie Sullivan) • Javascript Knowledge Base (Mike Samuel)

  7. Javascript Knowledge Base (JSKB) Javascript has become really interesting lately because of a few trends: • High quality libraries are making development easier • Good tools that minify code and find problems, e.g., YUI Compressor, Dojo ShrinkSafe, the Closure Compiler, Caja Web Tools (TBR) • And EcmaScript5 and HTML5 are releasing a whole host of fixes and features JSKB author Mike Samuel is an engineer on Caja and a member of the Secure EcmaScript working group.

  8. Javascript Knowledge Base (JSKB) Many developers want to use new features, but need to support older browsers.So they backport: • if (typeof JSON === 'undefined')  // Include json2.js here or they fallback: • if (typeof addEventListener !== 'undefined')  // use addEventListener • else •   // use attachEvent But this means shipping lots of unnecessary code to newer browsersthat don't need it -- higher bandwidth cost, slower loads, longer parse times.

  9. Javascript Knowledge Base (JSKB) JSKB will create a database of facts about browsers, such as: • On Firefox3.5, JSON is defined • On Firefox3.0, JSON is undefined • On IE, attachEvent is defined, while on Firefox addEventListener is defined This will allow compilers to find feature detection code that developers already write, and produce a version of the application optimized for a group of browsers. if (!window.JSON) { /* Optimized out on new browsers */ } As older browsers die, mean script size decreases.

  10. http://www.browserscope.orghttp://code.google.com/p/browserscope/http://groups.google.com/group/browserscopebrowserscope@googlegroups.comhttp://www.browserscope.orghttp://code.google.com/p/browserscope/http://groups.google.com/group/browserscopebrowserscope@googlegroups.com

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