Tags are formatting codes used in markup languages like HTML and XHTML. The input tag is important for user interaction and form building, with different types like button, checkbox, and text. XHTML requires proper closure while HTML does not.
A tag is formatting code that is part of a document language, also known as a markup language, used to annotate text as distinct from text and provides instructions on how to display the text. There are various markup systems that have a large number of unique tags. Markup systems or languages include TeX, Scribe, GML, SGML, HTML, XML, and XHTML. HTML stands for HyperText Markup Language and is used on the World Wide Web to create structures for text and documents and to create hyperlinks between documents, while XHTML (Extensible HTML) combines HTML and XML. The input tag is an HTML and XHTML tag and is supported by Microsoft® Internet Explorer®, Mozilla® Firefox®, Opera®, Google® Chrome® and Apple® Safari® browsers.
Many HTML and XHTML tags serve to format the text that is on the page, but some create opportunities for user interaction, and the input tag is one of the latter – it’s a key player in form building. However, there is an important difference between how the input tag is used in HTML and how it is used in XHTML. In HTML the tag is used, with the ellipses replaced by the content of the tag, and has no closing tag. In XHTML, the input tag requires a proper closure like this .
The input tag must include the type attribute to specify the type of control field to use. The possibilities are: button, checkbox, file, hidden, image, password, radio, reset, enter, and text. The button type usually has an action programmed with a client-side script, such as JavaScript®, while checkbox and radio buttons toggle on and off when clicked. The file type allows the user to upload a file, while hidden values are not displayed but remain attached to the form entry. Password differs from text in that it often has dots or asterisks to mask characters that are entered, and submit, image – which is sort of a submit button – and reset are global treatments of form data.
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