meter - The current numeric value. This must be between the minimum and maximum values (min attribute and max attribute) if they are specified. If unspecified or malformed, the value is 0. If specified, but not within the range given by the min attribute and max attribute, the value is equal to the nearest end of the range.

Usage note: Unless the value attribute is between 0 and 1 (inclusive), the min and max attributes should define the range so that the value attribute's value is within it. input - The initial value of the control. This attribute is optional except when the value of the type attribute is radio or checkbox.
Note that when reloading the page, Gecko and IE will ignore the value specified in the HTML source, if the value was changed before the reload. li - This integer attribute indicates the current ordinal value of the list item as defined by the <ol> element. The only allowed value for this attribute is a number, even if the list is displayed with Roman numerals or letters. List items that follow this one continue numbering from the value set. The value attribute has no meaning for unordered lists (<ul>) or for menus (<menu>).

Note: This attribute was deprecated in HTML4, but reintroduced in HTML5.

Note: Prior to Gecko 9.0, negative values were incorrectly converted to 0. Starting in Gecko 9.0 all integer values are correctly parsed. param - Specifies the value of the parameter. progress - This attribute specifies how much of the task that has been completed. It must be a valid floating point number between 0 and max, or between 0 and 1 if max is omitted. If there is no value attribute, the progress bar is indeterminate; this indicates that an activity is ongoing with no indication of how long it is expected to take. button - The initial value of the button. It defines the value associated with the button which is submitted with the form data.  This value is passed to the server in params when the form is submitted. data - This attribute specifies the machine-readable translation of the content of the element. option - The content of this attribute represents the value to be submitted with the form, should this option be selected. If this attribute is omitted, the value is taken from the text content of the option element.