clip.js

// Define some drawing attributes
c.font = "bold 60pt sans-serif";    // Big font
c.lineWidth = 2;                    // Narrow lines
c.strokeStyle = "#000";             // Black lines

// Outline a rectangle and some text
c.strokeRect(175, 25, 50, 325);     // A vertical stripe down the middle
c.strokeText("<canvas>", 15, 330);  // Note strokeText() instead of fillText()

// Define a complex path with an interior that is outside.
polygon(c,3,200,225,200);           // Large triangle
polygon(c,3,200,225,100,0,true);    // Smaller reverse triangle inside

// Make that path the clipping region.
c.clip();

// Stroke the path with a 5 pixel line, entirely inside the clipping region.
c.lineWidth = 10;       // Half of this 10 pixel line will be clipped away
c.stroke();

// Fill the parts of the rectangle and text that are inside the clipping region
c.fillStyle = "#aaa";             // Light gray
c.fillRect(175, 25, 50, 325);     // Fill the vertical stripe
c.fillStyle = "#888";             // Darker gray
c.fillText("<canvas>", 15, 330);  // Fill the text