Bootstrap 4 for IE8 and IE9
Several quick start options are available:
- Download the latest release
- Clone the repo
git clone https://github.com/coliff/bootstrap-ie8.git
- Install with npm
npm install bootstrap-ie8
- Install with yarn
yarn add bootstrap-ie8
- Install with Composer
composer require coliff/bootstrap-ie8:4.3.1
<meta http-equiv="x-ua-compatible" content="ie=edge">to the top of the of your page
Add the following conditional statements to the
<head>of your page but after the Bootstrap 4 CSS:
<!--[if IE 9]> <link href="https://cdn.jsdelivr.net/gh/coliff/bootstrap-ie8/css/bootstrap-ie9.min.css" rel="stylesheet"> <![endif]--> <!--[if lte IE 8]> <link href="https://cdn.jsdelivr.net/gh/coliff/bootstrap-ie8/css/bootstrap-ie8.min.css" rel="stylesheet"> <script src="https://email@example.com"></script> <![endif]-->
To fix the dropdown menus and modals you can add the following to the footer:
<!--[if gte IE 9]><!--> <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script> <script src="https://firstname.lastname@example.org/dist/js/bootstrap.bundle.min.js"></script> <!--<![endif]--> <!--[if IE 9]> <script src="https://cdn.jsdelivr.net/gh/coliff/bootstrap-ie8/js/bootstrap-ie9.min.js"></script> <![endif]--> <!--[if lte IE 8]> <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script> <script src="https://cdn.jsdelivr.net/gh/coliff/bootstrap-ie8/js/bootstrap-ie8.min.js"></script> <script src="https://email@example.com/dist/js/bootstrap.js"></script> <![endif]-->
This will load jQuery, PopperJS and Bootstrap as normal on all browsers other than IE8.
IE9 will load the
IE8 will load the latest compatible version of jQuery, the unminified Bootstrap JS (the minified version causes an error) and the
Q. What does this fix/polyfill?
A. Internet Explorer 9 doesn't support flexbox so there is a float-based layout fallback and a couple of other minor fixes. Internet Explorer 8 doesn't support rem units so all units are specified in pixels. Media Queries are also not supported so IE8 has a fixed-width layout (min-width 998px).
Q. Is the CSS hosted on a CDN?
A. Yes, thanks to JSDelivr minified versions are available with the direct links:
Q. Will you provide LESS/SASS files?
A. Maybe in a future release I'll provide SASS file (with comments).
Q. Do I need the RespondJS polyfill for IE8 like Bootstrap 3 uses?
A. No. Instead the CSS is set to be fixed-width which makes things a lot easier. You don't need to change your HTML markup, the CSS will take care of it as the (min-width:992px) media queries are all set.
Q. Where can I see a demo?
A. Right here: http://coliff.github.io/bootstrap-ie8/test.htm
- View a list of known issues at https://github.com/coliff/bootstrap-ie8/issues
Thanks to BrowserStack for providing the infrastructure that allows us to test in real browsers