Javascript is a dynamic computer programming language, most commonly used as part of web browsers, whose implementations allow client-side scripts to interact with the user, control the browser, communicate asynchronously, and alter the document content that is displayed.

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Unable to display CEWP 'builder' dialog on web part page: “showModalDialog” is not defined

I recently started encountering the following error when attempting to edit the source for content editor web parts (in page edit mode) on multiple pages in my site collection. Same error across ...