add font family to html code example

Example 1: css font face

@font-face {
  // Defining what the font will be called
  font-family: thisSpecialFont;
  // Linking to the font file
  src: url(linkToFontFile.woff);
}
body {
  font-family: thisSpecialFont;
}

Example 2: how to add font otf format in html

/*default version*/
@font-face {
	font-family: 'lovelyFont';
	src: url('fonts/lovely_font.eot'); 
	src: 
		local('Lovely Font'),
		local('Lovely-Font'),
		url('fonts/lovely_font.otf') 
		format('opentype');
}
/*bold version*/
@font-face {
	font-family: 'lovelyFont';
	src: url('fonts/lovely_font_bold.eot'); 
	src: 
		local('Lovely Font Bold'),
		local('Lovely-Font-Bold'),
		url('fonts/lovely_font_bold.otf') 
		format('opentype');
	font-weight: bold;
}
/*container element*/
div { font-family: 'lovelyFont', sans-serif; }
/*span elements inside the container div*/
span { font-weight: bold; }

Example 3: how to choose font in html

font-family: