Note that every HTML5 canvas element is blank by default and won't show until it's styled or has a drawing on it. Average Customer Review: Be the first to review this item. The HTML5 Canvas context object includes a useful method, measureText().When supplied with a text string, it will return some properties about that text based on the current context settings (font face, size, etc.) 376. HTML5 Canvas Tutorial: Useful Tips. The actual recognition happens on the server. Besides the canvas element’s width and height attributes, you can also use CSS to set the size of a canvas element. Sphere HTML5 Color Picker Plugin - jQuery ColorPicker.js The graphic to the left is created with