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For me, Tabs do not working in Safari. why?

The Tabs element not working in Safari, but work in Chrome.
the OS is : Mac 10.10 Yosemite Beta.

who know the reasons?

Tabs work fine in Safari.

@zfe you can’t, at all, submit questions raised from your OS X 10.10 developer preview.

Everything on it is at an early stage, including Safari. It means entire bricks, essential bricks of softwares are missing, and it’s normal. It’s not even a beta (beta means every feature is in, but some aren’t working well possibly), it’s a preview.

You should never install a developer preview on your main sessions of your production machine.

@zfe Sounds odd. Can you share an example site, so we can test it as well?