NOTE: Local Development Server feature is available in the Pulsar for Salesforce 3.8 pre-releases for Android and Windows. Some of the features listed here may change before official release.
Debugging your HTML/Javascript code in Pulsar doesn't require you to upload a bundle to Salesforce servers. With some configuration, you can instead have Pulsar load directly from a local development server on your own development machine.
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In the Pulsar app, go to the specific HTML document (or /.pulsarapp document ) you want to debug and open it
First, Pulsar will load the document/bundle that is synced from your org (the org version)
Next, Pulsar will load from your development server (http://127.0.0.1:3002); on Android this is forwarded over ADB.
NOTE that this means you can move backward and forward using the window history buttons to switch between the org and development versions (if desired)
Because Pulsar is loading your HTML/JS code from your development server on your development machine, you should now be able to use all your normal HTML/JS debugging tools on the code running locally on your development machine
If you make a change to your HTML/JS code, simply restart your development server and hit the page refresh button in Pulsar