What are the contents of the canvas tag?

tag is used to draw graphics, animation and other pixel-based image operations on web pages. Several commonly used related attributes and methods are: 1. "width and height attributes", used for Specify the width and height of the canvas; 2. "getContext('2d') method", obtain a 2D drawing environment; 3. "Drawing method", drawing context; 4. "Fill and stroke style"; 5. "Path Path" to define complex graphics; 6. "Gradient"; 7. "Picture drawing".

# Operating system for this tutorial: Windows 10 system, Dell G3 computer. The

tag is a new tag introduced in HTML5, which is used to draw graphics, animations and other pixel-based image operations on web pages. The following are several commonly used related attributes and methods of the tag:

• ##width and height attributes: used to specify the width and height of the canvas, either by setting the attribute value or through JavaScript to modify dynamically.

• getContext('2d') method: By calling this method, you can obtain a 2D drawing environment (context), and then you can use the drawing method provided by the environment to draw. A commonly used drawing context is '2d'.

• Drawing methods: The drawing context provides a series of methods for drawing graphics, such as fillRect() (drawing a filled rectangle), strokeRect() (drawing a border rectangle), arc() (Draw an arc) etc.

• Fill and stroke styles: You can use fillStyle and strokeStyle properties to set the fill and stroke styles of graphics, which can be color values, gradient objects, or pattern objects.

• Path: Use paths to define complex graphics, such as straight lines, curves, arcs, etc. The creation and operation of paths include using beginPath() to start a new path, moveTo() to move to a specified point, lineTo() to draw a line to connect two points, arcTo() to create an arc, etc.

• Gradient: The drawing context provides methods for creating linear gradients and radial gradients, such as createLinearGradient() and createRadialGradient(), which can be used to set fill and stroke gradients. Effect.

• Picture drawing: Use the drawImage() method to draw pictures onto the canvas.

These are just examples. The label and drawing context provide more functions and methods, and developers can further learn and practice as needed.

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