sentences:  Although web accessibility can be preserved using this technique, users should be aware that sIFR affects page loading time (from the multiple requests required for the Flash, JavaScript and CSS files used by sIFR).Also, the growing popularity of browser ad blocker plugins and some smartphones may prevent Flash content from loading, instead displaying a "block" button which thereby obscures the page data, although this can be adjusted through individual plugin settings.Since the creation of sIFR, dynamic web fonts support in browsers has been renewed, with at least the latest versions of the four most popular browsers supporting them.