Detailed explanation of the use and definition of css direction attribute

CSS directionThe attributes are simple and easy to remember, with few attribute values ​​and good compatibility. It saves worry and effort at critical times. It’s time to publicize it to everyone and don’t bury other people’s special skills.

Syntax:

direction : ltr | rtl | inherit

Parameters:
ltr: Text flow from left to right
rtl: Text flow from right to left
inherit: Text flow Value cannot be Inherited

Description:
Used to set the direction of text flow.
If you want to use the direction attribute for inline text, you must set the unicode-bidi attribute to embed or bidi-override.
The corresponding script feature is direction. Please see other books I have written.

Example:

div { direction: rtl; unicode-bidi: bidi-override; }

Basically, everyone only needs to care about the following two attribute values:

direction: ltr;   // 默认值direction: rtl;

Among them, ltr is the initial value, indicating left -to-right means from left to right. To describe it more specifically, it means that the inline content is arranged from left to right. This is how we usually process web pages. For example, the two before and after Picture , by default, the DOM in front is displayed on the left.

rtl is another value, the abbreviation of right-to-left, which means from right to left. To describe it in detail, the inline content is arranged from right to left, and is added to the application. This CSS statement means that for the two images before and after, by default, the one with the DOM in front is displayed on the right; and it is at the right end of the container.

For example, mm1 is Zhang Hanyun, and the DOM structure is as follows:

<p class="rtl"><img  src="/static/imghw/default1.png"  data-src="mm1.jpg"  class="lazy"   alt="Detailed explanation of the use and definition of css direction attribute" > <img  src="/static/imghw/default1.png"  data-src="mm2.jpg"  class="lazy"   alt="Detailed explanation of the use and definition of css direction attribute" ></p>

As a result, Zhang Meizi ran to the far right instead of the left. At the same time, it seemed that the container was right-aligned, as shown in the screenshot below:

What changes is only the left and right order of inline elementsblocks
It should be noted that when the value of the direction attribute is rtl, the front and back of our text The order has not changed, for example:

<p class="rtl"><span>span1</span> <span>span2</span></p>

The result is that span1 is still on the left and span2 is on the right:

Because only the inline element block has changed Left and right order, all text, even if separated by inline tags, is actually a homogeneous inline box and is treated as a whole. Therefore, there is only an approximate right alignment effect, and there is no left or right order for each text. The change.

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