Add iFrame test.

test/iframeTest.js

@@ -0,0 +1,101 @@
+var log = function(){
+	"use strict";
+	return function log(...str){
+		// eslint-disable-next-line no-console
+		console.log(...str);
+	};
+}();
+function draw(canvas){
+	"use strict";
+	
+	canvas.setAttribute("width", 220);
+	canvas.setAttribute("height", 30);
+	
+	var fp_text = "BrowserLeaks,com <canvas> 10";
+	
+	var ctx = canvas.getContext("2d");
+	ctx.textBaseline = "top";
+	ctx.font = "14px 'Arial'";
+	ctx.textBaseline = "alphabetic";
+	ctx.fillStyle = "#f60";
+	ctx.fillRect(125, 1, 62, 20);
+	ctx.fillStyle = "#069";
+	ctx.fillText(fp_text, 2, 15);
+	ctx.fillStyle = "rgba(102, 204, 0, 07)";
+	ctx.fillText(fp_text, 4, 17);
+	
+	return ctx;
+}
+function test(window){
+	"use strict";
+	
+	// create window canvas
+	var canvas = document.createElement("canvas");
+	// draw image in window canvas
+	var ctx = draw(canvas);
+	return window.HTMLCanvasElement.prototype.toDataURL.call(canvas);
+}
+
+function hash(string){
+	"use strict";
+	
+	var buffer = new TextEncoder("utf-8").encode(string);
+	return crypto.subtle.digest("SHA-256", buffer).then(function(hash){
+		var chunks = [];
+		(new Uint32Array(hash)).forEach(function(num){
+			chunks.push(num.toString(16));
+		});
+		return chunks.map(function(chunk){
+			return "0".repeat(8 - chunk.length) + chunk;
+		}).join("");
+	});
+	
+}
+
+function compare(string1, string2, alwaysOutputHashes){
+	"use strict";
+	function outputHashes(message){
+		Promise.all([
+			hash(string1),
+			hash(string2)
+		]).then(function(hashes){
+			// eslint-disable-next-line no-console
+			console.log(message, ...hashes);
+		});
+		
+	}
+	
+	if (string1 === string2){
+		if (alwaysOutputHashes){
+			outputHashes("Matching hashes:");
+		}
+		return "match";
+	}
+	else {
+		outputHashes("Hashes that differ:");
+		if (string1.length === string2.length){
+			let i;
+			for (i = 0; i < string1.length; i += 1){
+				if (string1.charAt(i) !== string2.charAt(i)){
+					break;
+				}
+			}
+			return "missmatch (first at " + i + ")";
+		}
+		else {
+			let i;
+			for (i = 0; i < Math.min(string1.length, string2.length); i += 1){
+				if (string1.charAt(i) !== string2.charAt(i)){
+					break;
+				}
+			}
+			return "missmatch (different lengths, first at " + i + ")";
+		}
+	}
+}
+var reference = test(window);
+hash(reference).then(function(hash){
+	"use strict";
+	
+	log("reference hash:", hash);
+});