sdk: drop polyfills, use jquery 3

static/index.html

@@ -38,7 +38,7 @@ button.again {
 			</div>
 		</div>
         
-        <script type="text/javascript" src="/jquery-1.12.4.min.js"></script>
+        <script type="text/javascript" src="/jquery-3.7.0.min.js"></script>
 		<script type="text/javascript" src="/sdk.js"></script>
         <script type="text/javascript">
 "use strict";

static/sdk.js

@@ -1,27 +1,6 @@
 ;(function() {
 	"use strict";
 	
-	var installPolyfills = function() {
-
-		// @ref https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toBlob 
-		if (!HTMLCanvasElement.prototype.toBlob) {
-			Object.defineProperty(HTMLCanvasElement.prototype, 'toBlob', {
-				value: function (callback, type, quality) {
-
-					var binStr = atob( this.toDataURL(type, quality).split(',')[1] ),
-						len = binStr.length,
-						arr = new Uint8Array(len);
-
-					for (var i = 0; i < len; i++ ) {
-						arr[i] = binStr.charCodeAt(i);
-					}
-
-					callback( new Blob( [arr], {type: type || 'image/png'} ) );
-				}
-			});
-		}
-	}
-
 	var getCurrentScriptPath = function () {
 		// Determine current script path
 		// @ref https://stackoverflow.com/a/26023176
@@ -391,8 +370,6 @@
 
 	var init = function() {
 
-		installPolyfills();
-	
 		var currentScriptPath = getCurrentScriptPath();
 		var baseURL = currentScriptPath.replace('sdk.js', '');
 		
@@ -451,7 +428,7 @@
 		// Load scripts
 		var needScripts = [];
 		if (typeof jQuery === "undefined") {
-			needScripts.push(contented.baseURL + "jquery-1.12.4.min.js");
+			needScripts.push(contented.baseURL + "jquery-3.7.0.min.js");
 		}
 		if (typeof DrawingBoard === "undefined") {
 			needScripts.push(contented.baseURL + "drawingboard-0.4.6.min.js");