对于一些属性,例如 width, height, padding, margin,绝对定位元素的偏移值 (比如 position 被设置为 absolute 或 fixed),当我们对其赋予百分比值时,这些值的计算值,就是通过元素的包含块计算得来。 确定包含块# 确定一个元素的包含块的过程完全依赖于这个元素的 position 属性: static、relative、sticky:包含块可能由...
我们可以改变定位上下文, 这是通过在元素的其他祖先之一上设置定位(即设置position: relative;或position: absolute;或position: fixed;)来实现的——它是嵌套在其中的元素之一。 默认情况下,被定位的元素都具有z-index,为auto,实际上为0。z-index只接受无单位索引值。静态定位的元素的z-index改不了,想改就先把该...
The position CSS property sets how an element is positioned in a document. The top, right, bottom, and left properties determine the final location of positioned elements.
位置(position) relative fixed absolute 为元素指定相对于其父元素的确切位置。只有在父元素使用 relative, fixed or absolute 时才有效。你可以为任何父元素指定 position: relative;因为它不会产生移动 static(默认值)和position 属性(除了 static)一起使用的, 有下列属性: top, right, bottom, left, width, hei...
In CSS, ::before creates a pseudo-element that is the first child of the selected element. It is often used to add cosmetic content to an element with the content property. It is inline by default.
// 为 shadow dom添加一些 CSS样式conststyle=document.createElement('style');style.textContent=`.wrapper { position: relative; } .info { font-size: 0.8rem; width: 200px; display: inline-block; border: 1px solid black; padding: 10px; ...
In CSS, ::after creates a pseudo-element that is the last child of the selected element. It is often used to add cosmetic content to an element with the content property. It is inline by default.
The<position>CSSdata type denotes a coordinate in a 2D space used to set a location relative to a box. A specific coordinate can be given by a two keywords, with specific offsets. A keyword represent one edge of the element's box or the medium line between two edges:left,right,top,bo...
The clip CSS property defines a visible portion of an element. The clip property applies only to absolutely positioned elements — that is, elements with position:absolute or position:fixed.
The perspective() CSS function defines a transformation that sets the distance between the user and the z=0 plane, the perspective from which the viewer would be if the 2-dimensional interface were 3-dimensional. Its result is a <transform-function> data