a - Specifies where to display the linked URL. It is a name of, or keyword for, a browsing context: a tab, window, or <iframe>. The following keywords have special meanings:

• _self: Load the URL into the same browsing context as the current one. This is the default behavior.
• _blank: Load the URL into a new browsing context. This is usually a tab, but users can configure browsers to use new windows instead.
• _parent: Load the URL into the parent browsing context of the current one. If there is no parent, this behaves the same way as _self.
• _top: Load the URL into the top-level browsing context (that is, the "highest" browsing context that is an ancestor of the current one, and has no parent). If there is no parent, this behaves the same way as _self.

Note: When using target, consider adding rel="noopener noreferrer" to avoid exploitation of the window.opener API. base - A name or keyword indicating the default location to display the result when hyperlinks or forms cause navigation, for elements that do not have an explicit target reference. It is a name of, or keyword for, a browsing context (for example: tab, window, or inline frame). The following keywords have special meanings:

• _self: Load the result into the same browsing context as the current one. This value is the default if the attribute is not specified.
• _blank: Load the result into a new unnamed browsing context.
• _parent: Load the result into the parent browsing context of the current one. If there is no parent, this option behaves the same way as _self.
• _top: Load the result into the top-level browsing context (that is, the browsing context that is an ancestor of the current one, and has no parent). If there is no parent, this option behaves the same way as _self. area - This attribute specifies where to display the linked resource. In HTML4, this is the name of, or a keyword for, a frame. In HTML5, it is a name of, or keyword for, a browsing context (for example, tab, window, or inline frame). The following keywords have special meanings:
• _self: Load the response into the same HTML4 frame (or HTML5 browsing context) as the current one. This value is the default if the attribute is not specified.
• _blank: Load the response into a new unnamed HTML4 window or HTML5 browsing context.
• _parent: Load the response into the HTML4 frameset parent of the current frame or HTML5 parent browsing context of the current one. If there is no parent, this option behaves the same way as _self.
• _top: In HTML4: Load the response into the full, original window, canceling all other frames. In HTML5: Load the response into the top-level browsing context (that is, the browsing context that is an ancestor of the current one, and has no parent). If there is no parent, this option behaves the same way as _self. Use this attribute only if the href attribute is present. form - A name or keyword indicating where to display the response that is received after submitting the form. In HTML 4, this is the name/keyword for a frame. In HTML5, it is a name/keyword for a browsing context (for example, tab, window, or inline frame). The following keywords have special meanings:
• _self: Load the response into the same HTML 4 frame (or HTML5 browsing context) as the current one. This value is the default if the attribute is not specified.
• _blank: Load the response into a new unnamed HTML 4 window or HTML5 browsing context.
• _parent: Load the response into the HTML 4 frameset parent of the current frame, or HTML5 parent browsing context of the current one. If there is no parent, this option behaves the same way as _self.
• _top: HTML 4: Load the response into the full original window, and cancel all other frames. HTML5: Load the response into the top-level browsing context (i.e., the browsing context that is an ancestor of the current one, and has no parent). If there is no parent, this option behaves the same way as _self.
• iframename: The response is displayed in a named <iframe>.

HTML5: This value can be overridden by a formtarget attribute on a <button> or <input> element. link - Defines the frame or window name that has the defined linking relationship or that will show the rendering of any linked resource.