JavaScript

For technical SEOs, JavaScript is a hot topic and will continue to be one for quite some time.

Google’s Gary Illyes recommends avoiding JavaScript redirects.

The startup does this by using its own JavaScript-based programming language that automates mixing of things like color, audio, graphics and dynamic type.

Review and optimize, minimize, consolidate, and strip as much JavaScript as you can from your site.

Until September, however, Google wasn’t calling out JavaScript libraries themselves.

All use open-sourced, mass-market code—the earliest run in Flash, the more recent in JavaScript.

AARON KOBLIN: We do a lot of experiments with HTML5, Javascript and WebGL.

JavaScript files on each page, uncompressed and without expires headers.

"There's no reason that should have ever been allowed," says Jones, of Twitter allowing JavaScript in the tweets.