BLANK_URL
is part of the IE6 fix so that the browser displays the iframe
background transparently when it freezes.
BLANK_IMG
is part of another IE6 fix so that the browser displays PNG images correctly when used as background images.
Whether you can remove them depends only on which browsers you want to support.
If you want to delete them, keep in mind that you must also delete the corresponding .js, including iehover-fix.js
for BLANK_URL
and / or ds-sleight.js
for BLANK_IMG
.
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