What is causing the border-radius property to malfunction on a particular website when using Internet Explorer?

We create browser add-ons for popular browsers like Google Chrome, Firefox, Safari, and Internet Explorer. Our add-ons inject HTML elements into various websites such as mail.google.com and email14.secureserver.net.

The HTML element we use has a border-radius CSS property set to 5px. It displays correctly on most websites and browsers, but when accessed through using Internet Explorer, the border-radius is not applied, and certain properties appear in red:

On mail.google.com:

On email14.secureserver.net:

What could be causing this issue and has the website disabled support for border-radius?

Is there a way to define border-radius that will work consistently across all websites, including email14.secureserver.net? I know that border-radius is compatible with Internet Explorer 9 and newer versions.

How can I check if email14.secureserver.net is running an older version of Internet Explorer, and is it possible to enable border-radius without affecting compatibility with older modes?

I personally use Internet Explorer 11, but I want this add-on to function smoothly across all versions of Internet Explorer.

htmlcssinternet-explorer

Answer №1

When a website requests IE to use an outdated engine for rendering, you can verify this by inspecting the page and checking if it is utilizing compatibility modes or older versions of the browser.

Answer №2

Upon reviewing your second screenshot, it appears that you have declared "borderRadius: 5px" before setting "border-top-left-radius:5px;".

The correct syntax should be border-radius instead of borderRadius. Using the incorrect syntax may be causing a conflict with the subsequent code. Keep in mind that border-radius is supported from ie9+ so it shouldn't be causing any issues.

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