Google Apps Script: An update to HtmlService

In an update from the Google Apps Developer Blog, Google announced enhancements to the HtmlService IFRAME sandbox mode, initially introduced in December 2014 to improve application user interfaces and allow the use of various JavaScript libraries. The update includes new features like Firefox support, file uploads, top navigation support, and improved Google Picker API support. As a result, Google is deprecating the NATIVE and EMULATED modes, with plans to retire them in stages by June 2016, encouraging developers to transition to the IFRAME sandbox mode using a provided migration guide. The transition timeline includes defaulting new scripts to IFRAME sandbox mode starting November 2015 and gradually phasing out EMULATED and NATIVE modes by April and June 2016, respectively. This phased deprecation aims to ensure a modern and secure environment for developing applications with Google Apps Script.