The tt tag is used for displaying teletype of monospaced text. It is not related to the designing of a table.

The maxlength attribute specifies the number of characters that the user can enter in a textbox. This value can be more than the value specified for the 'size' attribute.

A Web browser like Internet explorer, Chrome or FireFox can interpret the set of HTML tags within the page in order to display the page on the screen as the page's creator intended it to be viewed. It recieves the HTML tags from the server, reads it and renders or creates the page on the client system accordingly.

HTML tags are not case sensitive. For example to create a paragraph we can write P or p. The tags in XML are case sensitive.

Cell padding is the white space between the cell content and its borders. It defines the distance between the cell text and the boundary of the cell.

Heading is not a valid tag in HTML.

To define the size of the image, the correct attributes are width and height. Size is not a valid attribute of the img tag.

The _new attribute is not a valid html attribute.

Input type=Text or simply input creates a standard textbox. This can also have a value attribute, which sets the initial text in the textbox.

This is an invalid property value.

SGML or Standard Generalized Markup Language is the standard technology for defining generalized markup language for documents. HTML is an example of SGML based languages. SGML is not a language in itself but a description of how to specify a language.

Style sheets are normally saved in external .CSS files not .CCS files.

Link is an invalid attribute in the a(anchor) tag.

The font-weight property sets how thick or thin characters in text should be displayed. It can be used to display the text in bold letters.

The font-weight property sets how thick or thin characters in text should be displayed. The 'bold' or 'bolder' properties can be used to display the text in bold letters.

The h6 tag is the smallest heading tag. If some text is written inside a h6 and /h6 tag, it appears in bold but small letters. It can be used to display headings of a specific topic in a webpage.

The div tag defines a division or a section in an HTML document. It is also used to group block-elements to format them with CSS.

We can use the mailto command in an A HREF link tag to create an email link. Clicking on the link will invoke the clients' email client automatically. 

Choice is not a valid html form element.

The !DOCTYPE declaration must be the very first thing in your HTML document, before the html tag.

The id selector is used to specify a style for a single, unique element whereas the class selector is used to specify a style for a group of elements. Unlike the id selector, the class selector is most often used on several elements.

Selected is not a valid attribute of a Radio Button. To select a Radio Button the attribute checked is used.

The acronym tag defines an acronym.An acronym can be spoken as if it were a word, example HTML, ASP, etc. By marking up acronyms we can give useful information to browsers, spell checkers, translation systems and search-engine indexers. It has been replace by the abbr tag in HTML 5

Oval is not a valid value for the shape type. Although we can create a circle using the 'circle' attribute.

The HTML iframe tag is used to specify an inline frame. An inline frame allows us to embed another document within the current HTML document. We  can use the iframe src attribute to specify the source of the other document, as well as other attributes to determine the height, width, scrolling properties, border, etc.