function cssSupports (css) {
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return window.CSS && CSS.supports && (CSS.supports(css) || CSS.supports.apply(CSS, css.split(':')))
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}
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export default {
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'css.var': cssSupports('--a:0'),
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'css.env': cssSupports('top:env(a)'),
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'css.constant': cssSupports('top:constant(a)')
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}
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