Featured Images & Post Thumbnails
(also sometimes are images that represent an individual Post, Page, or Custom Post Type. When you create your Theme, you can output the featured image in a number of different ways, on your archive page, in your header, or above a post, for example.
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Setting a Featured Image
Once you add support for Featured Images, the Featured Image meta box will be visible on the appropriate content item’s Edit screens. If a user is unable to see it, they can enable it in their screen options.
By default, the Featured Image meta box is displayed in the sidebar of the Edit Post and Edit Page screens.
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Featured Images are given a class “wp-post-image”. They also get a class depending on the size of the thumbnail being displayed. You can style the output with these CSS selectors: