How to inspect the HTML of an email in Thunderbird

Imagine you have a list you want to render inline on large screens, but stacked on small screens.

<ul>
  <li>high</li>
  <li>medium</li>
  <li>low</li>
</ul>

ul { white-space: nowrap } /* optional: keep items in one line no matter th...

When you run code inside a $watch expression that forces a repaint (e.g. by computing an element's width, or running something like...

The parallel-gem is quite easy to use and can speed up rendering time if you want to render the same partial multiple times (e.g. for rendering long lists of things).
If your parallelized code talks to the da...

Native promises have no methods to inspect their state.

You can use the promiseState function below to check whether a promise is fulfilled, rejected or still pendi...

By default, Devise redirects to a sign-in form when accessing a route that requires authentication. If for some reason you do not want this, but use Basic Authentication (and the corresponding browser username/password dialog) instead, this is a s...

If you want to collapse/expand elements with dynamic content (and thus unknown height), you can not transition between height: 0 and height: auto.

Doing it properly, with modern CSS features

In the past, you might have resorted to bulky J...

Use Socket.gethostname. So for a machine whose hostname is "happycat", it will look like this:

>> Socket.gethostname
=> "happycat"

That should work right away for your Rails application. For plain Ruby, you first need to do:

requi...

Nobody needs HTML e-mails. However, you occasionally might have to write an HTML message for some weird reason. Here is how:

1. Hold the Shift-Key while clicking on "Write", "Reply", "Reply All", or "Forward".

That's it. :)

When you render a nested form for a Movie which has_many :actors, you want to render the right number of blank Actor forms. The right number means:

• A minimum number of blank forms so the user can add more Actors to an existing Movie, ...

There may be reasons to change the locale of your Postgres cluster. A popular one is your development system's locale being used by default (which may be annoying). Here is how to do that.

Beware: By following the steps below, you will drop and r...