Support Article

X-UA-Compatible META tag in Pega generated UI is still IE 5

SA-1658

Summary



A developer has noticed that Pega generated HTML contains the following
<meta http-equiv="X-UA-Compatible" content="IE=5">

Where did this come from?
Why is Pega using such an old standard?


Error Messages



None

Steps to Reproduce



None

Root Cause



You are seeing this due to installing the IE10/11 compatibility HFIXs mentioned here:
https://pdn.pega.com/user-interface/troubleshooting-ie10-and-ie11-ui-problems-fixed-by-prpc-5x-and-prpc-6x-hotfixes-for-ie5-quirks-mode

Resolution



Prior to Pega 7, PRPC requires quirks mode to render properly. The purpose of the compatibility mode HFIXs is to instruct newer modern browsers to render our document in Quirks mode. Without this, the browser defaults to standards mode which can cause various UI issues.
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Published January 31, 2016 - Updated October 8, 2020

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