add some support for unsupported browsers

index.css

@@ -2,7 +2,7 @@ body {
     margin: 0;
 }
 
-.animate, .loading {
+.animate, .loading, .warning {
     position: absolute;
     z-index: 1001;
 }
@@ -79,13 +79,17 @@ body {
     line-height: 22px;
 }
 
-
 .screen {
     width: 100%;
     height: 100%;
     z-index: 1000;    
 }
 
+.warning {
+    width: 256px;
+    text-align: justify;
+}
+
 body.OxThemeClassic,
 .OxThemeClassic .screen {
     background-color: rgb(240, 240, 240);    
@@ -116,4 +120,4 @@ body.OxThemeModern,
 }
 .OxThemeModern .readme .item.selected {
     background: rgb(32, 32, 32);
-}
+}

index.js

@@ -96,6 +96,11 @@ Ox.load(function() {
                     top: '8px',
                     right: '8px'
                 };
+            } else if (element == 'warning') {
+                css = {
+                    left: center - 128 + 'px',
+                    top: middle + 16 + 'px',
+                };
             }
             return css;
         },
@@ -122,7 +127,7 @@ Ox.load(function() {
                 });
             });
         },
-        load: function() {
+        load: function(browserSupported) {
             var url = app.url.get();
             if (url) {
                 app.user({url: url})
@@ -139,7 +144,19 @@ Ox.load(function() {
             app.$ui.loading.animate({opacity: 0}, 500, function() {
                 app.$ui.loading.remove();
             });
-            if (!url) {
+            if (!browserSupported) {
+                app.$ui.warning = app.ui.warning()
+                    .css(app.getCSS('warning'))
+                    .appendTo(Ox.$body);
+                app.$ui.logo
+                    .css({cursor: 'pointer'})
+                    .one({
+                        click: function() {
+                            app.$ui.warning.remove();
+                            app.load(true);
+                        }
+                    });
+            } else if (!url) {
                 app.$ui.logo
                     .css({cursor: 'pointer'})
                     .bind({
@@ -443,6 +460,16 @@ Ox.load(function() {
                             app.setTheme(data.value);
                         }
                     });
+            },
+            warning: function() {
+                return $('<div>')
+                    .addClass('warning')
+                    .html(
+                        'Aw, snap! This website requires an up-to-date, HTML5-compliant web browser. '
+                        + 'It should work fine in current versions of Chrome, Firefox and Safari, '
+                        + 'or Internet Explorer with Chrome Frame installed. '
+                        + 'To proceed at your own risk, click on the logo above.'
+                    );
             }
         },
         url: {