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I have just installed CentOS 7 and installed LAMP and have downloaded Joomla and extracted the zip and granted permissions to folders etc. If I navigate to localhost I get an error of

JHtmlBehavior::polyfill not found

What is causing this error to be displayed? This is a fresh OS install and a fresh Joomla install

EDIT
I am running php 7.1.4 & CentOS 7 & MariaDB

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This problem happens when you are using PHP 7 and IE 8 as a browser (or less). See this post for more details. Switch to another browser to resolve this issue. Joomla will likely release a fix to the problem soon.

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