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Assessing HTML5 Canvas Size: CSS vs. Element Attributes
In HTML5, the size of a canvas element can be determined either through CSS properties or element attributes. However, these approaches yield distinct results, leading to confusion.
Disparity in Result
When using CSS to define the canvas size, the canvas shrinks or expands as the web page is zoomed in or out. On the other hand, specifying the canvas size directly through element attributes, such as width and height, produces a consistent display regardless of zoom level.
Understanding the Mechanism
To grasp the difference, consider the following:
Practical Implications
The distinction between CSS size and element attribute size has practical implications:
Visualization
To illustrate the difference, visit http://jsfiddle.net/9bheb/5/, where you can observe how a canvas with a CSS size of 800px x 16px and an element attribute size of 32px x 32px behaves differently under zooming.
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