The new version also comes with a range of security fixes, including two $1,000 bounties and one $4,000 bounty paid to people who found high-severity vulnerabilities. Because Chrome automatically downloads updates by default in part to patch holes as fast as possible, people just need to restart the browser to update it.
IndexedDB, under development for years, is geared to store data for use even if a Web site or Web app is working with no network connection. It's used for offline Gmail and Google Docs, for example.
Math markup language makes it easier for the browser to display formulas like the quadratic equation -- not something everyone needs, but as with accents and currency symbols, something very useful to a particular subset.
Another feature, built into Chrome 24 but disabled by default, is support for CSS custom filters, a technology that makes some graphical elements programmable. Adobe developed the technology as part of its effort to build into Web standards some of the features in its Flash Player software.