--- a/Applications/StoneWebViewer/WebApplication/print.js	Mon Nov 16 22:17:01 2020 +0100
+++ b/Applications/StoneWebViewer/WebApplication/print.js	Tue Nov 17 09:32:40 2020 +0100
@@ -23,32 +23,23 @@
   var body = $('body');
   body.addClass('print');
 
-  // because firefox does not support/executes codes after the cloned document as been rendered
-  // https://bugzilla.mozilla.org/show_bug.cgi?format=default&id=1048317
-  // we cannot calculate using the good body size for the clone document
-  // so we have to hardcode the body width (meaning we can only renders in A4 in firefox);
-  var uaParser = new UAParser();
-  var isFirefox = (uaParser.getBrowser().name === 'Firefox');
-  var isIE = (uaParser.getBrowser().name === 'IE');
-  var isEdge = (uaParser.getBrowser().name === 'Edge');
-  //console.log('ua parser', uaParser.getBrowser());
-  
-  if (isFirefox || isIE || isEdge) {
-    if (0) {
-      // This is Letter
-      body.css('width', '8.5in');
-      body.css('height', '11in');
-    } else {
-      // This is A4
-      body.css('width', '210mm');
-      body.css('height', '296mm');  // If using "297mm", Firefox creates a second blank page
-    }
+  if (0) {
+    // This is Letter
+    body.css('width', '8.5in');
+    body.css('height', '11in');
+  } else {
+    // This is A4
+    body.css('width', '210mm');
+    body.css('height', '296mm');  // If using "297mm", Firefox creates a second blank page
   }
 
+  // https://webglfundamentals.org/webgl/lessons/webgl-resizing-the-canvas.html
+  var realToCSSPixels = window.devicePixelRatio;
+
   $('#viewport canvas').each(function(key, canvas) {
     if ($(canvas).is(':visible')) {
-      $(canvas).width($(canvas).parent().width());
-      $(canvas).height($(canvas).parent().height());
+      $(canvas).width(Math.floor(realToCSSPixels * $(canvas).get(0).clientWidth));
+      $(canvas).height(Math.floor(realToCSSPixels * $(canvas).get(0).clientHeight));
     }
   });
 
@@ -73,8 +64,7 @@
 });
 
 
-var printMedia = window.matchMedia('print');
-printMedia.addListener(function(mql) {
+window.matchMedia('print').addListener(function(mql) {
   if (mql.matches) {
     // webkit equivalent of onbeforeprint
     beforePrint();