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In cases where Jetpack's
safecss_filter_attr
is used in place of core's function (and possibly other scenarios), there may be semi-colons in unexpected places.For example,
background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA...);
In that case,
explode
will break the style, splitting it in the middle of a value. Withpreg_split
we can specify semi-colons that are not inside parentheses.