.. _pages/internet_explorer_specific_settings#internet_explorer_specific_settings: Internet Explorer specific settings *********************************** This page describes all settings which are used/implemented by qooxdoo to workaround/solve IE-specific issues. .. _pages/internet_explorer_specific_settings#document_mode_in_ie8: Document Mode in IE8 ==================== qooxdoo uses *Internet Explorer 8 standard mode* as the default for all generated applications. This is achieved by setting a XHTML 1.2 Doctype to all *index.html* files provided by the framework. .. _pages/internet_explorer_specific_settings#using_alpha-transparent_pngs: Using alpha-transparent PNGs ============================ IE7 and IE8 have built-in support for loading alpha-transparent PNGs. qooxdoo however does use the AlphaImageLoader for all IE versions whenever a PNG image has to be loaded. This has several reasons: * Performance issues in IE8 - native alpha PNG support is slower when running IE8 standards mode * Rendering bug in IE - reported at `Bug #1287 `_ .. _pages/internet_explorer_specific_settings#url-rewriting_under_https: URL-Rewriting under HTTPS ========================= Every IE version does show a *Mixed Content* warning whenever a resource (image, script, etc.) is loaded with a regular HTTP request when the containing page runs under HTTPS. However, this useful warning is also appearing in situations it is not acceptable, e.g. for relative paths like *./path/to/my/resource*. In order to solve these issues every URL of a resource managed by qooxdoo is rewritten in IE under HTTPS to an absolute URL to prevent the warning. See `Bug #2427 `_ for more details.