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ELEMENT HIERARCHY IN CSS

 

 

 

Causes the top edge of the origin image to be aligned with the top edge of the background. top may be used in conjunction with the keywords left, center, and right. If it is used by itself, top is equivalent to the value 50%.
Causes the bottom edge of the origin image to be aligned with the bottom edge of the background. bottom may be used in conjunction with the keywords left, center, and right. If it is used by itself, bottom is equivalent to the value 100%.
Causes the left edge of the origin image to be aligned with the left edge of the background. left may be used in conjunction with the keywords top, center, and bottom. If it is used by itself, left is equivalent to the value 0%.

The html element is the root element of your page, and, as such, is at the base of your document tree. It is the parent of its child elements — namely, the head and body elements, which have their own children, which in turn have their own children, and so on down the line. Elements that share the same parent are called siblings. Tags placed more than one level down the tree from a given point are considered descendants of thecss hook with a css decoding tool.

If you want to apply the rules of inheritance to our document, these three properties will be handed down to all elements contained within the body of our document — or, to use the language of our document’s family tree, to all elements that are descendants of the body. Already we’ve demonstrated why CSS is such a powerful presentation engine. With four lines of a single style rule, we’ve done the work of a small army of font elements.

Conversely, elements near the top of the tree can be considered ancestors to those that are nearer the bottom. There you have it, all the neatly arranged hierarchy of a family tree.

The term origin image is a condensed way of saying “place from which the tiling of the background image will commence.” By default, a background image is repeated in all four directions—up, down, right, and left—infinitely. (See background-repeat for information on how to alter this behavior.) Changing the position of the origin image can change the way the background is laid out.

For example, a grid-pattern will look quite different if it tiles from the center of the background, instead of from the top left corner. This difference will be seen primarily around the edges of the element’s background, where the clipping of the background will change depending on the origin image’s placement.

If a length unit and a percentage are used together, or if two length or two percentage values are specified, then the first is used for the horizontal axis, and the second for the vertical. Length and percentage values may be negative, and will push the origin image above and to the left of the top left corner of the element’s box. However, there may be unexpected results, as user agents are not required to support this behavior. Keyword combinations may occur in any order, thanks to their inherent meanings.
When thinking of our markup in this hierarchical manner, it’s much easier to envision exactly how styles will propagate down the various branches.

According to the syntax rules covered, we know that this rule tells the user agent to select all body elements and apply a serif typeface (looking on the client’s machine for Georgia, Times New Roman, or a generic sans-serif font, in that order), sized at 12 pixels and colored in black (#000).
While inheritance is perhaps the most powerful aspect of CSS, it can at times also be one of the more confusing. Keep in mind that not all properties are inherited. Margin and padding are two such examples. Those properties are applied solely to an element, and are not inherited by its descendants.

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