Comparison of Layout Engines (non-standard HTML) - Proprietary HTML Elements

Proprietary HTML Elements

Tag Function Supported first by Alternative solution Trident Gecko WebKit KHTML Presto
bgsound Used to add sound to the background of a website Internet Explorer audio <3.1 No No No Dropped
blink Used to display a blinking text Netscape Javascript, CSS No 1.7 No No 1.0
bq Used to display a blockquote WebTV, HTML 3.0 blockquote No No No No Dropped
comment Used to allow the addition of comments to HTML documents Internet Explorer, WebTV 3.1 No No No No
ilayer Inline layers Netscape (4 only) iframe No No No Partial No
image Synonym of img ? img 3.1 Yes Yes Yes Yes
layer Used to create multiple layers of text and images which lay on top of each other in a given order Netscape (4 only) CSS, AJAX No No No Partial No
marquee Used to display a scrolling, marquee-like text. Internet Explorer, WebTV JavaScript, CSS3 3.1 1.7 125 3.3 1.0
nobr Prevents any line breaks from occurring within the flow of a text Netscape CSS 3.1 Yes Yes Yes Yes
noembed Displays an alternative text for browsers which do not recognize the embed tag Netscape Child elements of object used as fallback
spacer Adds whitespace in a layout Netscape CSS No Dropped No No No
wbr Placed inside a nobr element to add a line break Netscape Unicode character zero-width space (U+200B) Dropped 1.7 Yes 3.1 No
xml Delimits an XML data island inside an HTML page Internet Explorer ? 3.1 No No No No

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