...
Wet signatures are not supported in older versions of some browsers. You might want to hide s a section in your form that has a wet signature if the browser does not support it. To get details about the browser where your form is loaded, add a text control to your form with its CSS Class property set to detectbrowser and use the following custom JavaScript:
...
Use the browser information populated in your text control to decide if the section with wet signature should be displayed or not.