HTML | canvas globalAlpha Property

The globalAlpha property is used to set or return the current alpha or transparency value of the drawing. The value must be a number between 0.0 to 1.0.
Here, 0.0 denotes fully transparent and 1.0 denotes no transparency. By default it is 1.0.

Syntax:

context.globalAlpha=number

Property values:

number: It is the value between 0.0 to 1.0.

Example:

<!DOCTYPE html> 
<html> 
  
<body> 
    <h3 style="color:green">GeeksforGeeks</h3> 
    <h3>HTML canvas globalalpha property</h3> 
    <canvas id="myCanvas"
            width="200"
            height="200" 
            style="border:2px solid ;"> 
  </canvas> 
  
    <script> 
        var can = document.getElementById("myCanvas"); 
        var gfg = can.getContext("2d"); 
        gfg.fillStyle = "green"; 
        gfg.fillRect(50, 50, 95, 50); 
  
        //Turn transparency on 
        gfg.globalAlpha = 0.5; 
        gfg.fillStyle = "green"; 
        gfg.fillRect(50, 100, 95, 50); 
    </script> 
  
</body> 
  
</html> 

Output:

Browsers supported:

Chrome
Internet Explorer 9.0
Safari
Firefox
Opera

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