The HTML5 canvas API has only two attributes. Which are they?

• A. Length and width
• B. Width and height
• C. Height and depth
• D. Width and area

Answer: (B)

In HTML5, the canvas element provides a space for rendering graphics, and it is defined with two essential attributes: width and height. These attributes set the dimensions of the canvas in pixels and are crucial for determining how the canvas will display content. The width attribute specifies the horizontal size, while the height attribute sets the vertical size of the canvas space.

Using width and height allows developers to control the aspect ratio and size of the graphics or images they draw within the canvas. If these attributes are not specified, the default size is 300 pixels wide and 150 pixels high, which may not fit the visual design of the webpage.

The other options presented do not accurately reflect the appropriate attributes of the HTML5 canvas. For instance, length and depth are not standard terms in the context of specifying canvas dimensions, and area does not directly correspond to an attribute controlling canvas size. Understanding and applying the correct attributes is essential for effective web development with HTML5 canvas elements.