html5 - Why is .ico preferred over .png for favicons? -

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i noticed inadvertently saved favicon png. , nothing bad happened.

what gained saving .ico. way done ( i've looked @ many favicon links in other web-apps ), i'm trying understand @ deeper level.

i'm saving @ 32px 32px. here boiler plate.

<link id='file_icon' rel='icon' href = 'foo/foo.png'>

compared to:

<link id='file_icon' rel='icon' href = 'foo/foo.ico'>

mainly because .gif , .png files don't work favicons in internet explorer.

also, .ico format allows store customized versions @ different resolutions, i.e. 16x16, 32x32, 64x64 pixels, , various color depths (16, 24 or 32 bits), insuring best possible available icon, regardless of size or color depth available in browser.

http://www.photoshopsupport.com/tutorials/jennifer/favicon.html


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