sentences:  It is a scalable variety of HTML text-to-flash replacement pioneered by Shaun Inman.CSS support in web browsers did not, at the time of sIFR's creation, allow webpages to dynamically include web fonts, so there was no guarantee that fonts specified in CSS or HTML would show as intended, as the browsing user may or may not have had the specified font installed in their system.sIFR embeds a font in a Flash element that displays the text, pre-empting the need for a font to have been manually pre-installed on a user's system.