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Bootstrap 4 for IE8 and IE9

Bootstrap 4 drops support for Internet Explorer 8 and 9, but you can add it back by simply adding a conditional statement targeting IE 8 and 9 with a CSS file and a CDN-hosted JavaScript file to polyfill HTML5 element support.

Quick start

Several quick start options are available:

Download the latest release
Clone the repogit clone https://github.com/coliff/bootstrap-ie8.git
Install withnpmnpm install bootstrap-ie8
Install withyarnyarn add bootstrap-ie8
Install withComposercomposer require coliff/bootstrap-ie8:4.3.1

Usage

Add<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://cdn.jsdelivr.net/g/html5shiv@3.7.3"></script><![endif]-->

Optional JavaScript Fix

To fix the dropdown menus and modals you can add the following to the footer:

<!--[if gte IE 9]><!--><scriptsrc="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script><scriptsrc="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/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://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/js/bootstrap.js"></script><![endif]-->

This will load jQuery, PopperJS and Bootstrap as normal on all browsers other than IE8.IE9 will load thebootstrap-ie9.js script.IE8 will load the latest compatible version of jQuery, the unminified Bootstrap JS (the minified version causes an error) and thebootstrap-ie8.js fix.

FAQS

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 toJSDelivr 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