another application in which matching is important is in the validation of html documents html is the standard format for hyperlinked documents on the internet in an html documentportions of text are delimited by html tags simple opening html tag has the form "and the corresponding closing tag has the form commonly used html tags include bodydocument body section header centercenter justify pparagraph olnumbered (orderedlist lilist item ideallyan html document should have matching tagsalthough most browsers tolerate certain number of mismatching tags we show sample html document and possible rendering in figure