I often encounter an annoying phenomenon. I select an address in the browser (Firefox):
Copy it into my adress bar, using the !maps DuckDuckGo bang:
We immediately see the problem: house number and zip code do not get separated, and more often than not Google Maps then fails to find the address (unsurprisingly).
The code in this case is:
<address>
Hans-Sachs-Str. 8<br>80469 Munich<br>Germany
</address>
I can imagine similar code with <p> or <div> instead of address; the relevant part seems to be how <br> will be copy-pasted.
The following is also conceivable:
<tr><td>Hans-Sachs-Str. 8</td></tr>
<tr><td>80469 Munich</td></tr>
Which copies in just the same way.
So if I put an address on my website (or write a user style), how can I make addresses copy-paste in a helpful way, e.g. with a comma between the individual fields/lines?
Answers with HTML5 and CSS3 are fine, and current browsers can be required; I don't care about backwards compatibility. Answers without Javascript are preferred.
I tried br::before { content: ", "; } but that didn't work.

