The ID/AccessKey/Class/CSS Inspector Panel shows information on the attributes (ID, AccessKey, and Class) of elements that have been set and the information for any Cascading Style Sheets (CSS) applied to the target page. This panel has four tabs.
The ID tab lists the elements that have ID attributes. The ID attribute of an HTML element can be used by Web browsers to determine which style sheets to apply to the element.
The AccessKey tab lists the elements that have AccessKey attributes. An AccessKey attribute of an HTML element assigns an access key to the element. An access key is a single character, and pressing the ALT key plus an access key moves the focus to the corresponding element.
The Class tab lists the elements that have Class attributes:
The CSS tab lists the URLs of the CSS files that are applied to the target page.