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favicon: .ICO или все-таки .PNG (a W3C standard) ?

chich

Asked by chich,

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ICO или PNG  

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chich Explorer

chich

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Posted

Всем привет!

Почему почти на всех сайтах код начинается с <!DOCTYPE HTML PUBLIC "-//W3C//DTD... - то есть получается что код валиден по стандартам W3C. Но почему же тогда везде используется favicon.ico вместо favicon.png?

Посмотрите тут http://www.w3.org/2005/10/howto-favicon

This document does not discuss in detail how to create a favicon image. However, the format for the image you have chosen must be 16x16 pixels or 32x32 pixels, using either 8-bit or 24-bit colors. The format of the image must be one of PNG (a W3C standard), GIF, or ICO.
The first approach for specifying a favicon is to use the rel attribute value "icon" and to define what the value means via a profile; profiles are discussed in more detail below. In this HTML 4.01 example, the favicon identified via the URI http://example.com/myicon.png as being a favicon:

<!DOCTYPE html 
	  PUBLIC "-//W3C//DTD HTML 4.01//EN"
	  "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en-US">
<head profile="http://www.w3.org/2005/10/profile">
<link rel="icon" 
	  type="image/png" 
	  href="http://example.com/myicon.png">
[…]
</head>
[…]
</html>

И если кто-то врубится зачем юзать profile пожалуйста отпишите тоже

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SelenIT Explorer

SelenIT

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Posted

Не все, что "валидно по стандартам W3C", понимается всеми браузерами (особенно IE). Как раз с PNG-картинками в IE издавна были проблемы (то гамма слишком темная, то прозрачность некорректно работает...). Ради кроссбраузерности приходится идти на компромиссы со строгостью стандартов, как и во многом другом. Имхо...

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