How to switch to f3?[![here](https://i.stack.imgur.com/OHr0m.png)](https://i.stack.imgur.com/OHr0m.png)

How to know the current frame?

None of the commands below works:

```
driver.switch_to.frame('f3')
driver.switch_to.frame(driver.find_element_by_xpath("//frameset[@name='viewfrm']"))
driver.switch_to.frame(driver.find_element_by_xpath("//frameset[@name='f3']"))

```