Solution: The transition-timing-function property takes the value ease. It specifies a transition effect with a slow start, then fast, then end slowly and this is the default value, ease-in specifies a transition effect with a slow start.

Solution: linear value specifies a transition effect with the same speed from start to end, ease-in-out specifies a transition effect with a slow start and end, ease-out specifies a transition with a slow end.

Solution: transition-duration specifies how many seconds or milliseconds a transition effect takes to complete, a transition is a shorthand property for setting the four transition properties into a single property.

Solution: transition-timing-function specifies the speed curve of transition effect, transition-property specifies the name of the CSS property the transition effect is for, transition-delay specifies a delay in seconds for transition effect.

Solution: Content-type:string is a MIME string defining the format of the content being returned, example is content-type:text/html, last-modified: string defines the date of last modification of the file.

Solution: expires: sate string defines the date when information becomes invalid. This should be used by the browser to decide when a page needs to be refreshed. A valid date string should be in the format 01 Jan 1998 12:00:00 GMT.

Solution: content-length: string specifies the length in bytes of the data being returned. The browser uses this value to report the estimated download time for a file. Set-cookie: string set the cookie passed through the string.

Solution: The data type of the content is defined by content_type variable, used when the client is sending attached content to the server, like file upload etc, the length of the query information is defined by content_length, it’s available only for POST requests.

Solution: http_cookie returns the set cookies in the form of key and value pair, in http_user_agent user-agent request-header field contains information about user agent originating the request. It’s the name of the web browser.

Solution: path_info provides the path for the CGI script, query_string gives URL-encoded information that is sent with GET method request, remote_addr gives the IP address of the remote host making the request.