X-Browserism
Netscapeism and Microsoftism is the use of browser specific markup in your webpage.
This handful of markup has been created by the 'big two' in an effort to promote their
browser by means of offering an exclusive 'feature'. Two 'features' that come to mind are
<blink> by Netscape and <marquee> by Microsoft. With the advent of DHTML
we are sure to see a rash of new tags and attributes from both browsers. That is
why I have created this list. It is not meant as a reference chart
of valid HTML but just the opposite. Think of it as a wanted poster in your local
post office; if you ever see any of the following run away and call your favorite
validator.
Microsoft:
<marquee>
<font> (deprecated in HTML 4.0 by the W3C)
<animate>
<body bgproperties="fixed">
<body leftmargin="">
<body topmargin="">
<img dynsrc="">
<img controls="">
<img loop="">
<img start="">
<iframe> (now a W3C recommendation)
<table background="">
<table bordercolorlight="">
<table bordercolordark="">
<tr bordercolorlight="">
<tr bordercolordark="">
<th background="">
<th bordercolorlight="">
<th bordercolordark="">
<td background="">
<td bordercolorlight="">
<td bordercolordark="">
<hr color="">
Netscape:
<embed>
<frame> (now a W3C recommendation)
<body bgcolor=""> (deprecated in HTML 4.0 by the W3C)
<spacer>
nosave
