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HTML Canvas Reference : First, draw a red rectangle, then set transparency (globalAlpha) to 0.5, and then draw a blue and a green rectangle
The numbers in the table specify the first browser version that fully supports the property.
globalAlpha | |||||
---|---|---|---|---|---|
font | Yes | 9.0 | Yes | Yes | Yes |
The globalAlpha property sets or returns the current alpha or transparency value of the drawing.
The globalAlpha property value must be a number between 0.0 (fully transparent) and 1.0 (no transparancy).
Default value: | 1.0 |
---|---|
JavaScript syntax: | context.globalAlpha=number; |
Value | Description | Play it |
---|---|---|
number | The transparency value. Must be a number between 0.0 (fully transparent) and 1.0 (no transparancy) | Play it » |
❮ HTML Canvas Reference