A wireless communication device may include a communication interface, a screen configured to display a graphical user interface (GUI) of a native application, a processor, and memory containing instructions of the native application that, when executed by the processor, cause the wireless communication device to perform operations including: requesting and receiving, by way of the communication interface, data that defines content for display on the GUI, an arrangement of the content, and a script; displaying the content in accordance with the arrangement; receiving input that modifies some of the content as displayed; determining that the wireless communication device is in an offline mode; invoking execution of the script; and while the wireless communications device is in the offline mode: (i) obtaining, as a result of the execution of the script, modifications to the content, and (ii) displaying, on the GUI, the content as modified in accordance with the arrangement.