Document Editing Problems

Fix Word Online Not Displaying Custom XML Data in Content Controls

Maira Mehtab Sep 20, 2026 868 views

Question details

The user needs to view updated CustomXmlParts data mapped to content controls in a Word document, but the data fails to render in Word Online.

Product: Word Online
Device & OS: not provided
Scenario: Opening and viewing a document containing custom XML-mapped content controls in a web browser.
Observed behavior: Updated custom XML data appears correctly in the Word desktop application but is completely missing or not displayed in Word Online, despite general content control support.

Before you start

Verify that your document's CustomXmlParts are properly mapped to the content controls and that the updated data successfully displays in the desktop version of Word before assuming a web-specific issue.

Solution 1Recommended

Open the Document in the Word Desktop Application

Since Word Online has limited support for advanced content controls, you must use the desktop application to view and update XML-bound data reliably.

Word Online offers standard viewing and editing capabilities but lacks full processing support for advanced programmatic features like CustomXmlParts mapped to content controls. To ensure your custom XML data renders properly, you must transition your session from the web environment to the fully featured desktop version.

Locate the Ribbon Menu in Word Online

While viewing your document in Word Online, navigate to the top ribbon menu where the primary editing tools are located.

Select Open in Desktop App

Click the 'Viewing' or 'Editing' button on the ribbon, then select 'Open in Desktop App' from the dropdown to launch the full Microsoft Word software.

Verify the XML Data Rendering

Once the document opens locally in the desktop application, inspect the specific content controls to confirm that the custom XML data is now displayed correctly.

Provide Feedback to Microsoft: Because Microsoft's official documentation implies content control support without detailing this specific Custom XML limitation, consider submitting a feature request via the Help menu in Word Online to advocate for full web support.

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Frequently Asked Questions

Why do my content controls work in Word Desktop but not Word Online?

Word Online is a simplified version of the desktop software designed for standard editing tasks. It intentionally excludes processing for advanced programmatic features, like CustomXmlParts mapped to content controls, to keep the web application fast and lightweight.

Can I edit XML-mapped content controls on a Mac?

Yes, the Microsoft Word desktop application for Mac supports content controls, but the developer tools and XML mapping features may function differently or require add-ins compared to the Windows version. Always ensure you are using the desktop app rather than the browser version.

Will Microsoft add full XML support to Word Online in the future?

Microsoft continuously updates its web applications, but there is currently no official timeline for full CustomXmlParts and advanced content control support in Word Online. Users heavily reliant on this feature should stick to desktop applications.

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