Alphaimage loader filter
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What is an alpha image loader filter and what does it do to on page optimization?
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It's an old proprietary filter used to try to fix rendering in older Internet Explorer browsers (IE 6 and earlier) that didn't properly support transparency in .png images.
Its use is harmful for page optimisation because it blocks rendering for the rest of the page while it is processing for each element.
Since most of us no longer worry about supporting IE 6 and older in our site designs, it's not worth using at the expense of all our modern browser users.
Paul
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