Apple has seeded Safari 5.1.4 to developers, a release that includes improvements to JavaScript and asks developers to test printing PDFs and zooming in and out with plug-in content.
Apple’s patch notes:
JavaScript Performance Enhancements
Safari 5.1.4 on Lion includes many fixes that enhance JavaScript performance. Please test webpages that use JavaScript and look for compatibility issues.
Plug-Ins & Zooming
Please test interaction with plug-ins and the appearance of plug-in content while zooming. Please test zooming using gestures and keyboard shortcuts.
Printing PDFs
Please test printing PDFs loaded into Safari as well as PDFs displayed in iframes. Using PDFs Printed from Webpages
Please test links in PDFs created from webpages using Safari 5.1.4.
The developer seed requires Mac OS X 10.7.3, which was just released to the public on Wednesday. Safari 5.1.3 was released at the same time.