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(Scott Mitchell) One of the features of ASP.NET 1.0 was its adaptive rendering capabilities that allowed for the markup rendered by an ASP.NET web page to be appropriate for the visiting browser. In short, when an ASP.NET page is visited its Web controls are rendered into markup that is sent down to the browser and displayed. The markup generated by the Web controls, however, depends upon the browser being used to visit the page. When visited by an "uplevel browser" ASP.NET Web controls render HTML 4.0-compliant markup; for "downlevel" browsers, the Web controls render HTML 3.2-compliant markup. In ASP.NET 1.x, browsers were labeled as "uplevel" or "downlevel" via the element in machine.config or web.config (one downside of ASP.NET 1.x was that, by default, only IE 4.0 and up was marked as "uplevel" meaning modern browsers like FireFox and Opera were flagged as downlevel). See A Look at ASP.NET's Adaptive Rendering for more information on ASP.NET 1.x's adaptive rendering functionality. |
