问题
I've got an HTML element that has a CSS hover-state. There's a bug with the margin or padding on hover and every time I mouseover, the contents of the element slide a little, its annoying.
I'd like to debug using FireBug or Chrome Dev Tools, but a common problem I've had with these tools is that after I select the element from Firebug/devtools I obviously need to move the mouse back to the dev tools and the hover state is no longer enabled.
How do I inspect/debug an HTML element using these tools with the element in its hover state?
回答1:
Chrome Dev Tools has a built-in :hover state selector in the Elements > Styles panel. You can toggle other pseudo-classes (like :active) there as well.
回答2:
For testing :hover states in Chrome
For testing :hover state in Firefox (You need firebug add on)
回答3:
Here's a screen shot for firebug & those not sharp enough to see agriboz's comment (like me)
回答4:
Now you can see both the pseudo-class style rules and force them on elements.
To see the rules like :hover in the Styles pane click the small dotted box button in the top right.
To force an element into :hover state, right click the element.
Alternatively, you can use Event Listener Breakpoints sidebar pane in the Scripts panel and select to pause in mouseover handlers.
来源：https://stackoverflow.com/questions/10601431/inspecting-hover-state-in-firebug-or-chrome-devtools