The difference between inline elements and block-level elements: an in-depth understanding of element classification in HTML

The difference between inline elements and block-level elements: an in-depth understanding of the classification of elements in HTML

In HTML, elements can be divided into two categories: inline elements and block-level elements. . Understanding their differences is very important to correctly master the layout and style of HTML. This article will provide an in-depth understanding of the characteristics of inline elements and block-level elements, and provide specific code examples.

1. Inline elements

Inline elements refer to elements that are displayed inline by default in HTML documents. They do not occupy an entire row, but appear closely within a row based on how the document flow is arranged. Common inline elements include , , , , etc.

The characteristics of inline elements are as follows:

(1) They will not occupy a single line, but are closely arranged from left to right;
(2) There is no width and height setting Options, the width and height are determined by the content;
(3) You cannot set the top and bottom margins (margin-top, margin-bottom), top and bottom padding (padding-top, padding-bottom);
(4 ) You can set left and right margins and left and right padding;
(5) It cannot contain block-level elements, but can only contain inline elements or text.

The following is a specific code example that demonstrates the characteristics of inline elements:

<span style="border: 1px solid black; padding: 5px;">这是一个行内元素</span>
<span style="border: 1px solid black; padding: 5px;">这是另一个行内元素</span>

Run the above code in the browser, you can see that two inline elements are closely arranged in one line, and Width and height automatically adapt to the size of the content.

2. Block-level elements

Block-level elements refer to elements that are displayed in block-level mode by default in HTML documents. They occupy an entire line, and each block-level element wraps to another line. Common block-level elements include

,

,

~

, etc.

The characteristics of block-level elements are as follows:

(1) It occupies a whole line, and each block-level element will be displayed in a new line;
(2) The width and height can be set;
(3) You can set top and bottom margins, top and bottom margins;
(4) You can include inline elements, block-level elements or text.

The following is a specific code example that demonstrates the characteristics of block-level elements:

<div style="border: 1px solid black; padding: 5px;">
    <p>这是一个块级元素</p>
    <p>这是另一个块级元素</p>
</div>

Run the above code in the browser, you can see that two block-level elements occupy one line and have the same width. and height can be set via CSS styles.

Summary:

The classification of inline elements and block-level elements in HTML is based on how they are displayed. Inline elements are tightly arranged in rows and will not occupy an entire row, while block-level elements occupy an entire row, and each block-level element will be displayed on a new line. We can choose to use inline elements or block-level elements according to actual needs, and combine them with CSS styles to achieve various complex layout and style effects.

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