Is my browser having a stroke?

Hahah! Ok, I see.

"Was it understandable?" Not really, no. 

Periods do denote an abbreviation, but I have never seen suffixes used. For example:

• the abbreviation for "abbreviation" is abbr.
• the abbreviation for "abbreviations" is not abbr.s, it's abbr.
• the abbreviation for "abbreviated" is not abbr.d, it's abbr.
• the abbreviation for "abbreviating" is not abbr.ing, it's abbr.

If the reader can't tell which form of the word is being abbreviated via context clues from the rest of the sentence, then the abbreviation should not be used. Hope that helps. :)