html elements can be divided into block-level elements and row-level elements.
What are block-level elements?
It can occupy a line by itself, and can set the width and height. The default is 100%;
(recommended related tutorials: html tutorial)
Row-level elements On the contrary, its content determines its width and height, and special characters are treated as text.
Example:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title> HTML块级、行级元素，特殊字符，嵌套规则</title>
</head>
<body>
<!-- 块元素:独占一行，可以设置宽高、默认宽度100% -->
块元素分为文字类和容器类
文字类块元素:p、h1——h6
容器类块元素：div、table、tr、td、frame、ul>li、ol、dl、dt、dd（序列）
<!-- 行元素:不独占一行，宽高度取决于内容 -->
行元素：a img input strong em del span
特殊字符：文字 br   hr
</body>
</html>Nesting rules:
1. Block elements can be nested in row elements;
2. Row elements can be nested Nested line elements;
3. Line elements cannot be nested in block elements;
4. Text block elements cannot be nested in block elements;
5. Container classes Block elements can nest block elements.
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