An initiative by websites to inform users to update their web browser

Customize and test

Test the script

If you open your website with #test-bu appended to the url, the bar will always show up. Example: Make sure the page is properly reloaded by opening the url in an new browser tab.


The following options can be passed to the script:

var $buoop = {
    vs: {i:8,f:25,o:17,s:9,c:22},  // Specifies browser versions to notify. Negative numbers specify how much versions behind current version to notify.
                                   // f:22 ---> Firefox <= 22
                                   // c:-5 ---> Chrome <= 35 if current Chrome version is 40.
    reminder: 24,                  // after how many hours should the message reappear
                                   // 0 = show all the time
    reminderClosed: 150,           // if the user explicitly closes message it reappears after x hours
    onshow: function(infos){},     // callback functions after notification has appeared / was clicked / closed
    onclick: function(infos){},
    onclose: function(infos){},

    l: false,                       // set a fixed language for the message, e.g. "en". This overrides the default detection.
    test: false,                    // true = always show the bar (for testing)
    text: "",                       // custom notification text (html)
                                    // Placeholders {brow_name} will be replaced with the browser name, {up_but} with contents of the update link tag and {ignore_but} with contents for the ignore link.
                                    // Example: Your browser, {brow_name}, is too old: <a{up_but}>update</a> or <a{ignore_but}>ignore</a>.
    text_xx: "",                    // custom notification text for language "xx"
                                    // e.g. text_de for german and text_it for italian
    newwindow: true,                // open link in new window/tab
    url: null,                      // the url to go to after clicking the notification
    noclose:false,                  // Do not show the "ignore" button to close the notification
    nomessage: false,               // Do not show a message if the browser is out of date, just call the onshow callback function
    jsshowurl: "//", // URL where the script, that shows the notification, is located. This is only loaded if the user actually has an outdated browser.
    api: xxx                        // This is the version of the browser-update api to use. Please do not remove.

Change the style

The following CSS rules are applied by the notification. You can overwrite them in your own CSS. To do so you need to add some more specificity to the css-rules: e.g. body .buorg {font-size:20px}

.buorg {
    background-position: 8px 17px; 
    border-bottom:1px solid #A29330;    
    background-color: #fff8ea;    
    font: 17px Calibri,Helvetica,Arial,sans-serif;    
    box-shadow: 0 0 5px rgba(0,0,0,0.2);
.buorg div { 
    padding: 11px 12px 11px 30px;  
    line-height: 1.7em; 
.buorg div a,.buorg div a:visited { 
    text-indent: 0; 
    color: #fff;    
    text-decoration: none;    
    box-shadow: 0 0 2px rgba(0,0,0,0.4);    
    padding: 1px 10px;    
    border-radius: 4px;    
    font-weight: normal;    
    background: #5ab400;    
    white-space: nowrap;   
    margin: 0 2px; display: inline-block;

    background-color: #edbc68;

@media only screen and (max-width: 700px){
.buorg div { 
    padding:5px 12px 5px 9px; 
    text-indent: 22px;
    line-height: 1.3em;
.buorg {
    background-position: 9px 8px;}