How to debug CSS in Android native browser?

I've tried weinre on Android 2.2 stock browser and it is working nicely

To set up it,

sudo npm install -g weinre

// make it available to external (than just localhost)
weinre --boundHost -all-

// include this line (change to your IP address) to every page to be tested
<script src="http://xxx.xxx.x.xxx:8080/target/target-script-min.js#anonymous"></script>

More details from this website Remote debugging with weinre

I finally found Weinre. This solution belongs to the Cordova project. http://people.apache.org/~pmuellr/weinre/docs/latest/

Just to give a more recent option.

You can use BrowserSync too. Currently it has Weinre already integrated to this.

# Using a local.dev vhost
$ browser-sync start --proxy

# Using a local.dev vhost with PORT
$ browser-sync start --proxy local.dev:8001

# Using a localhost address
$ browser-sync start --proxy localhost:8001

# Using a localhost address in a sub-dir
$ browser-sync start --proxy localhost:8080/site1

http://www.browsersync.io/docs/command-line/