I have been trying to find the CSS3 badge in a SVG format but it wasn’t that easy. The HTML5 one was the first result on Google. Now finally I found one. I am posting it here because now I will never lose it!
Here is the CSS3 logo:
Here is the HTML5 logo in-case you need it:
I found the logos on this website. They were in one single SVG file and I split them up.