.fillText( string, x, y, isCentred=false )
Draws the given String, filled, to this Image at the x/y location. This will draw using the font set on this Image, which can be set using the 'setFont' method.
Like similar methods, 'isCentred' allows you to state if the x/y location is the top-left corner (when false), or the middle of the string (when true).
Multi-line text is supported through including the end of line character, "\n", in a string.
Note that how this is rendered is heavily dependent on the browser, and the OS. You should never expect text to look exactly the same on all machines.
.fillText( string, x, y, xAlign, yAlign )
The same method, but with x and y axis alignment parameters. See the article on How Alignment Works for more details.