1.) Validation: This is the process of verifying information entered in a form. 2.) <mark> : This tag is used to highlight text on a page. 3.) URL: This value (a URL or Uniform Resource Locator) will allow the user to go to a specific page using a complete address. 4.) <fieldset> : This tag is used to group related elements (often used with <legend> for a descriptive title). 5.) autofocus : This attribute moves the focus to a particular input field when a web page loads. 6.) Placeholder: This text is displayed in an input field when the field is empty. (Note: The question has a typo - "its emply" should be "is empty"). 7.) Comment: This is a marker within an HTML document (using <!-- ... --> ). 8.) required : The required attribute ensures that the person who fills out the form follows the correct criteria you have set for input (by requiring a value in the field). Other attributes like pattern , min , max , etc., can also enforce specific input criteria. 9.) Form: This is where a user enters information into fields in a web form. 10.) <time> or <datetime> : These tags are used to indicate that a web page contains time or date information. <time> is generally preferred for simpler time/date representations.