Quirks mode ie9 what is it

Improve this answer. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Does ES6 make JavaScript frameworks obsolete? Podcast Do polyglots have an edge when it comes to mastering programming Featured on Meta. Now live: A fully responsive profile. Related Forces the use of the standard mode for HTML rendering and results in the application terminating for all browsers that do not support this mode e.

Internet Explorer earlier than Version 9. Browse pages. A t tachments 0 Page History. Jira links. Document mode in Internet Explorer The following rules determine how Internet Explorer selects the document mode : The Developer Tools F12 setting overrides any document mode specified by a webpage. The setting remains active for the lifetime of the tab. In Internet Explorer 9 and higher, if the document is hosted in an iframe element, the document mode is determined by the document mode of the top-level webpage.

Contents Exit focus mode. The following rules determine how Internet Explorer selects the document mode: The Developer Tools setting overrides any document mode that's specified by a webpage. The setting remains active for the lifetime of the tab. In Internet Explorer 9, if the document is hosted in an iframe element, the document mode is determined by the document mode of the top-level webpage. Subdocuments can't be rendered in Internet Explorer 9 mode unless the top-level document is also in Internet Explorer 9 mode.

The Compatibility View settings can force a webpage to be displayed in a less-standard document mode. Group Policy settings override other settings and force all webpages to be displayed in the specified document mode. Most of the sections don't apply to Microsoft Edge unless this is explicitly indicated: 2. For more information about how to configure document modes, see the following articles: Deprecated document modes and Internet Explorer 11 Specifying legacy document modes.

Therefore, we recommend that you start your testing process as follows: If your enterprise primarily uses Internet Explorer 8 or Internet Explorer 7, start testing by using Enterprise mode.

If your enterprise primarily uses Internet Explorer 10 or Internet Explorer 9, start testing by using the various document modes. Important Enterprise mode takes precedence over document modes.

Officially, the rules for rendering a webpage are evaluated in the following order by Internet Explorer: Internet Explorer Developer Tools settings — Manually setting the browser mode user agent string in Internet Explorer 11 and Document mode overrides all other settings.

Iframe settings for example, iframe specific X-UA-compatible. X-UA-Compatible meta tag — This value can be specified in the web application generated page header or inserted by the web server or application server to select Internet Explorer's Document mode.