property editable

This property sets and gets the the editable state of the document. Changing the editable state reloads the document asynchronously. While the document is loading some features are not accessible.

var box = scene.getBoxById("htmlBox");
if (box)
{
    // box will no be in compose mode so the user can edit content.
    box.editable = true;
    box.defaultFont = 'Arial';
}