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CSS圖層定義

僅管目前只是工作草稿, CSS 圖層 ( CSS positioning ) 目前 Microsoft's IE 4.0 和 Netscape's Communicator 都支援。 圖層開啟了全新的網頁領域,不必要再用笨拙的表格來控制網頁中的物件位置, 您現在可以精確的想放那就放那。(按:positioning 光譯為位置是不夠的, Netscape 中同樣的效果有新的 Layer 標籤可完成,Layer 比較能清楚的表示 CSS positioning 功能,因此我譯為"圖層")

運作方式是;當流覽器以CSS圖層來顯示網頁中某一個物件時,是以一個可見的(visible) 矩形區域,稱為範圍框(bounding box).您可以設定這個框距離流覽器視窗的上邊/左邊界 (一般稱為 絕對位置), 或是設距離其他頁面上物件一段距離 (一般稱為相對位置)。 您也可以指定這個框的高度及寬度。 您甚至可以把其中一個框放在另一個框之上, 如果真的這麼作會造成整個框被覆蓋住,因此 CSS 圖層句含了裁切屬性, 能讓您裁切一部份框的區域。如讓頂層的物件來顯示底層的內容,最後您可以 完全的讓某一個框 顯示出來或隱藏起來

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