How can we make Internet Explorer 11 mimic Internet Explorer 9 in HTML?

How can I ensure that Internet Explorer 11 uses CSS styles from IE9 in my HTML?

I have tried the following code:

<script runat="server">
        private void Page_PreRender(object sender, EventArgs e)
        {
            var meta = new HtmlMeta();
            meta.Content = "IE=EmulateIE9";
            meta.HttpEquiv = "X-UA-Compatible";
            this.Page.Header.Controls.AddAt(0, meta);
        }
</script>

or

<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE9">

In order to maintain consistent styles across all versions of Internet Explorer by using IE9 as the standard.

This is the code snippet I am using:

<!--[if IE]>
        <link rel="stylesheet" type="text/css" href="~/App_Themes/CocktailSite/master-interno-ie.css" media="screen" />
   <!--[else]>
        <link rel="stylesheet" type="text/css" href="~/App_Themes/CocktailSite/master-interno.css" media="screen" />
<![endif]-->

It works fine on IE9 where it takes master-interno-ie.css, but on IE11 it reverts back to master-interno.css.

I have looked at various answers here but none seem to work in my specific case.

Answer №1

Browsers no longer recognize conditional comments.

Starting with the latest browser versions, conditional comments are no longer acknowledged in standard mode. It is recommended to use feature detection instead to create efficient fallback options for website functionalities that may not be supported by certain browsers.

Answer №2

I managed to solve this with the help of jQuery.

Within my code, right between the scripts and links, I included the following function:

function detectIE() {
    var userAgent = window.navigator.userAgent;
    var index = userAgent.indexOf("MSIE");

    if (index > 0) return true;    
    else if (!!navigator.userAgent.match(/Trident\/7\./)) return true;
    else return false;
}

Following that, I added the code snippet:

if (detectIE()) {
    jQuery('head').append('<link rel="stylesheet" type="text/css"     href="~/App_Themes/CocktailSite/master-interno-ie.css" media="screen" />');
}     

This approach perfectly suits my requirements and has been successfully tested across all versions of Internet Explorer, Google Chrome, and Mozilla Firefox.

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