Silk4J does not support HTML frames and iframes on Apple Safari on iOS.
Recording a mobile web application on Chrome for Android 43 or later, while the mobile web application is zoomed and the top-left corner is not visible on the screen, might not work as expected. If the green rectangles for the controls in a mobile web application are not correctly displayed during recording, zoom-out the mobile web application completely, scroll to the top-left corner of the mobile web application, and refresh the Recording window.