WebMarkupMin.AspNet4.WebForms contains 5 Web Forms page classes: `MinifiedHtmlPage` (supports HTML minification only), `MinifiedXhtmlPage` (supports XHTML minification only), `CompressedPage` (supports HTTP compression only), `MinifiedAndCompressedHtmlPage` (supports HTML minification and HTTP compression) and `MinifiedAndCompressedXhtmlPage` (supports XHTML minification and HTTP compression); and 5 master page classes: `MinifiedHtmlMasterPage` (supports HTML minification only), `MinifiedXhtmlMasterPage` (supports XHTML minification only), `CompressedMasterPage` (supports HTTP compression only), `MinifiedAndCompressedHtmlMasterPage` (supports HTML minification and HTTP compression) and `MinifiedAndCompressedXhtmlMasterPage` (supports XHTML minification and HTTP compression).

Classes of the Web Forms pages and master pages cannot be used together.