Hmm, too bad that the HTML4 code they propose fails validation with my validator (Nokigiri) and the HTML5 code they propose doesn't seem to work on HTML4 pages.

Hmm, too bad that the HTML4 code they propose fails validation with my validator (Nokigiri) and the HTML5 code they propose doesn't seem to work on HTML4 pages. I solved it by mixing and matching the two: <div class="g-plusone" size="small" count="false"></div> This fails the official W3C validator but it works with Nokogiri. The odd way to set the language of the button {"lang":"de"} trips up syntax error marking in my IDE too.