inline flow sensor| raven flow meter

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1. opt other micro

2. Discuss some interesting CSS topics (3) - What do you know about stacking order and stacking context

Open book series, discuss some interesting CSS topics. Apart from practicality, some topics aim to broaden the thinking of problem-solving, and also involve some CSS details that are easily overlooked. Solving problems without considering compatibility, the questions are imaginative, and you can say whatever comes to mind. If there are any CSS properties that you feel are rare during the solving process, go and take some tutoring now. Keep updating, keep updating, keep updating, say important things three times. All the questions are summarized on my Github.

3、 How much do you know about stacking level and stacking context? Z-index may seem simple, as it determines the priority of stacking based on the level of z-index. However, delving deeper, one will discover the universe within. Take a look at the following question, define two div A and B, which are included under the same parent div tag. The HTML structure is as follows: # divA display: inline block # divB float: left. Their CSS definitions are as follows: container{ position:relative; background:#ddd;}.container > div{ width:200px; height:200px;}.float{ float:left; background-color:deeppink;}.inline-block{ display:inline-block; background-color:yellowgreen; margin-left:-100px;} Roughly speaking, it means that two DIVs with a common parent container are stacked together. Should display: inline block be stacked on top, or float: left be stacked on top? Note the order of DOM here, which is to generate display: inline block first, and then float: left. Of course, the DOM order of the two can also be reversed as follows: #

divB float: left # divA display: inline block. You will find that regardless of the order, the div for display: inline block is always stacked above. Demo poked me. This actually involves the so-called stacking level, which can be well explained by a diagram: using the logic in the above diagram, the problem above can be easily solved. The stacking level of inline bck is higher than that of float, so regardless of the order of DOM, it is stacked on top. However, the statement in the above diagram is somewhat inaccurate. According to the official statement of W3, the accurate 7th layer is: the background and borders of the element forming the stacking context.the child stacking contexts with negative stack levels (most negative first).the in-flow, non-inline-level, non-positioned descendants.the non-positioned floats.the in-flow, inline-level, non-positioned descendants, including inline tables and inline blocks.the child stacking contexts with stack level 0 and the positioned descendants with stack level 0.the child stacking contexts with positive stack levels (least positive first). The background and border of the elements that form the stacking context environment have negative z-index sub stacking context elements (the higher the negative, the lower the stacking level), normal streaming layout, non inline block, non position oriented (except static) sub elements, non position oriented (except static) floating elements, normal streaming layout, inline block elements, non position oriented (except static) sub elements (including display: table and display: inline), sub stacking context elements with z-index: 0, sub stacking context elements with positive z-index: (the lower the positive, the lower the stacking level),

inline flow sensor

1. opt other micro

2. Discuss some interesting CSS topics (3) - What do you know about stacking order and stacking context

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