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The overall definition of a survey page is called the Theme. Typically you would use the same theme throughout a survey, but if you want some pages to differ from the others, you can create one theme for each different look.
Authoring' themes have built-in "Accessibility" functionality, such that the surveys using those themes are easier for respondents with disabilities to use. The functionality is activated via a menu command (go to About Accessibility for more information) or a checkbox on the theme property page (go to Theme Properties for more information).
Note that you can set a theme to be the "Inline Theme". This theme will then be used by default when the survey is displayed as an inline survey (go to Web Options for more information).
To create a new theme in the Themes folder, right-click on the Themes folder and select Insert Theme from the menu. Note that when a new theme is created in a survey layout, the default document type will be set to HTML5.