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.
Published January 31, 2016 - Updated October 8, 2020
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