Optional text as an alternative to the graphic for rendering in non-graphical environments. Alternate text should be provided whenever the graphic is not rendered. Alternate text is mandatory for Level 0 documents.
Along with the width attribute, specifies the size at which the element is drawn. Returns the calculated height of the element in pixels. In HTML, this attribute may be initially set in pixels or percentages.
An SGML identifier used as the target for hypertext links or for naming particular elements in associated style sheets. Valid names to script with are any alphanumeric string that begins with a letter. Valid special characters include underbar "_".