in this page : http://www.w3schools.com/tags/playcanvas.asp?filename=playcanvas_filltextmaxwidth
Note: The maxWidth parameter is not supported in Chrome or Safari.
it's work fine with Chrome 43.0.2357.124 unknown (64-bit)
UA : Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.124 Safari/537.36