Practical cases, in-depth analysis

Preface

What is? css A block element ？

Block level elements are displayed on a single line . Its sibling element must not be in the same line as it is （ Unless out of the document stream ）. To put it more generally , It's a block element (block element) It's usually the container element of other elements , Can hold other block elements or inline elements .

css Three characteristics of block elements ：

• Each block level element is on its own line , The following elements can only start on another line , It's not possible for two elements to share one line .

• Height of element 、 Width 、 Row height and top bottom margin can be set .

• If the width of the element is not set , The default is the width of the parent element .

Element characteristics ：

Blocky element

：

• Display in a rectangular area on the page .

• Top down , Monopolize one line

• You can add width and height directly

• In general , As a container for other elements or content

Inline elements

：

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    The smallest unit in a page is also a rectangle .

• Arrange one by one in a row .

• You can't add width and height directly , Size is supported by content .

• Inline elements also conform to the rules of the box model , But there are problems with individual attributes （padding-top/bottom margin-top/bottom）

• When inline elements are arranged in a row , There is a gap between them

In line fast element

：

• Width and height can be set .

• By default , Show them one by one in a row , There is a gap between them .

• Of the current element display The value is inline-block when , Can support vertical-align attribute .

Common elements ：

Blocky element ：

Inline elements ：

Inline block element ：

Element type conversion ：

display attribute

： effect ： Retrieve or set the box model type generated by the element .

Common attribute values

：

• display:block; effect ： Turning elements into blocks , It has the characteristics of massive elements . Add ： Most of the massive elements , default display The values are all block;

• display:inline; effect ： Turn elements into inline elements , Having the characteristics of inline elements . Add ： Most inline elements , default display Value inline;

• display:none; effect ： Hide current , It doesn't take up space .

summary

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The content includes html,css,JavaScript,ES6, computer network , browser , engineering , modularization ,Node.js, frame , data structure , performance optimization , Projects, etc .

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Summary of front-end interview questions

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JavaScript

performance

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