SharePoint Designer Workflow: Passing HTML in url parameters

If trying to pass some html as a url parameter in a link in a SharePoint Designer workflow like below,

if you just add it to a link parameter like so:

&msg=<h2>Thank you [% Current Item:Assigned To %] for approving<br/><br/>You may now close this tab.</h2>

it gets encoded so your < will become %3C, etc.  To get around this, if you create a variable and encode it:

like so:

%3Ch2%3EThank%20you%20[% Current Item:Assigned To %]%20for%20approving%20your%20direct%20reports%20for%20this%20fiscal%20quarter.%3Cbr%2F%3E%3Cbr%2F%3EYou%20may%20now%20close%20this%20tab.%3C%2Fh2%3E

then you can just use the variable in the link and it will display as you'd like it:

&msg=<h2>Thank%20you%20Sean%20Regan%20for%20approving.<br%2F><br%2F>You%20may%20now%20close%20this%20tab.<%2Fh2>