概要
ユーザエージェントによって自動的に計算される値です。その具体的な効果は auto が適用されたプロパティ毎にそれぞれ異なります。
auto 値の使用が可能なプロパティ
overflowoverflow-xoverflow-ycursorwidthmarker-offsetmargin- margin-* (left|bottom|top|right|start|end)
bottomlefttable-layoutz-indexcolumn-width
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