diff --git a/core/boot.js b/core/boot.js
index 44553e2c1..639d8812e 100644
--- a/core/boot.js
+++ b/core/boot.js
@@ -32,7 +32,7 @@ In practice, each module is wrapped in a separate script block.
 
 // Set up $tw global for the server
 if(typeof(window) === "undefined" && !global.$tw) {
-	global.$tw = {isBrowser: false};
+	global.$tw = {}; // No ``browser`` member for the server
 }
 
 // Boot information
@@ -419,7 +419,7 @@ $tw.wiki = new $tw.Wiki();
 
 /////////////////////////// Browser definitions
 
-if($tw.isBrowser) {
+if($tw.browser) {
 
 /*
 Execute the module named 'moduleName'. The name can optionally be relative to the module named 'moduleRoot'
@@ -526,12 +526,12 @@ $tw.wiki.shadows.addTiddlers(
 	$tw.wiki.deserializeTiddlers("(DOM)",document.getElementById("shadowArea"))
 );
 
-// End of if($tw.isBrowser)
+// End of if($tw.browser)
 }
 
 /////////////////////////// Server definitions
 
-if(!$tw.isBrowser) {
+if(!$tw.browser) {
 
 var fs = require("fs"),
 	path = require("path"),
@@ -640,7 +640,7 @@ $tw.plugins.loadPluginsFromFolder(path.resolve($tw.boot.wikiPath,"./shadows"));
 // Load tiddlers from wiki tiddlers directory
 $tw.plugins.loadPluginsFromFolder(path.resolve($tw.boot.wikiPath,"./tiddlers"),null,null,$tw.wiki);
 
-// End of if(!$tw.isBrowser)	
+// End of if(!$tw.browser)	
 }
 
 /////////////////////////// Final initialisation
diff --git a/core/bootprefix.js b/core/bootprefix.js
index d8989e3b4..ec69f6fe7 100644
--- a/core/bootprefix.js
+++ b/core/bootprefix.js
@@ -14,7 +14,7 @@ See Boot.js for further details of the boot process.
 
 // Set up $tw global for the browser
 if(window && !window.$tw) {
-	window.$tw = {isBrowser: true};
+	window.$tw = {browser: {}};
 }
 
 $tw.modules = {titles: {}}; // hashmap by module name of {fn:, exports:, moduleType:}
diff --git a/core/modules/startup.js b/core/modules/startup.js
index f76f79fcc..1b47a6be6 100644
--- a/core/modules/startup.js
+++ b/core/modules/startup.js
@@ -14,6 +14,15 @@ This is the main application logic for both the client and server
 
 exports.startup = function() {
 	var modules,n,m,f,commander;
+	// This should be somewhere else
+	if($tw.browser) {
+		$tw.browser.prefix = document.body.style.webkitTransform !== undefined ? "webkit" : 
+							document.body.style.MozTransform !== undefined ? "Moz" :
+							document.body.style.OTransform !== undefined ? "O" : null;
+		$tw.browser.transition = $tw.browser.prefix + "Transition";
+		$tw.browser.transform = $tw.browser.prefix + "Transform";
+		$tw.browser.transformorigin = $tw.browser.prefix + "TransformOrigin";
+	}
 	// Set up additional global objects
 	$tw.plugins.applyMethods("global",$tw);
 	// Wire up plugin modules
@@ -30,7 +39,7 @@ exports.startup = function() {
 	// Get version information
 	$tw.version = $tw.utils.extractVersionInfo();
 	// Load up the tiddlers in the root of the core directory (we couldn't do before because we didn't have the serializers installed)
-	if(!$tw.isBrowser) {
+	if(!$tw.browser) {
 		$tw.plugins.loadPluginsFromFolder($tw.boot.bootPath,"$:/core",/^\.DS_Store$|.meta$|^modules$/);
 	}
 	// Set up the wiki store
@@ -41,7 +50,7 @@ exports.startup = function() {
 	// Set up the command plugins
 	$tw.Commander.initCommands();
 	// Host-specific startup
-	if($tw.isBrowser) {
+	if($tw.browser) {
 		// Display the PageTemplate
 		var renderer = $tw.wiki.parseTiddler("PageTemplate");
 		renderer.execute([],"PageTemplate");
diff --git a/core/modules/utils.js b/core/modules/utils.js
index f1acf54ec..46410dacd 100644
--- a/core/modules/utils.js
+++ b/core/modules/utils.js
@@ -335,7 +335,7 @@ exports.getVersionString = function() {
 Extract the version number from the meta tag or from the boot file
 */
 
-if($tw.isBrowser) {
+if($tw.browser) {
 
 // Browser version
 exports.extractVersionInfo = function() {