Can notice that, some HTML tags like

always start with a new line and have a line length stretching 100% of the web page, while other HTML tags like ,

Simply answered, this difference is due to different display values: Block and Inline.

The values ​​of the Display attribute

Display: inline value

Inline is a way to display on a row and the width of that tag will depend on the content of the tag, so many tags can be on the same row. However, inline cannot use the attributes width, height and top-bottom margin. The HTML tags displayed inline default are,,,, .

 span.a { 
  display: inline; /* mặc định với span, a, strong, b, i. */ 
  width: 100px; 
  height: 100px; 
  padding: 5px; 
  border: 1px solid blue; 
  background-color: #DB7093; 
 } 

Display properties

display: inline

In this example, the width and height attributes are not available, span tags are on the same line side by side, some attributes apply to affect the content on other lines.

Display value: block

Block is a display that always starts with a new line and is as wide as 100% of the page width. So when you use this card, although the content is short, the other tags at the bottom are still in a different line. The difference of this tag is that it can use the width and height attributes . HTML tags that display the default block are:

 span.b { 
  display: block; 
  width: 100px; 
  height: 100px; 
  padding: 5px; 
  border: 1px solid blue; 
  background-color: #DB7093; 
 } 

Display properties

display: block

In this example, the width and height attributes are usable, but because of the fixed size, the longer content will overflow.

Display: inline-block value

Inline-block is a way of displaying the combination of both ways, moving the element to display on the same row but it still inherits the properties of the block.

 span.c { 
  display: inline-block; 
  width: 100px; 
  height: 100px; 
  padding: 5px; 
  border: 1px solid blue; 
  background-color: #DB7093; 
 } 

Display properties

display: inline-block

Compared to display: inline, inline-block display can use the attributes width, height and top-bottom margin.

Compared to display: block, inline-block display does not break the line after the end of the tag, so the cards can be placed side by side.

Use inline-block to create navigation links

Display: inline-block is mainly used for displaying the navigation list horizontally:

 .nav { 
  background-color: yellow; 
  list-style-type: none; 
  text-align: center; 
  padding: 0; 
  margin: 0; 
 } 
 
 .nav li { 
  display: inline-block; 
  font-size: 20px; 
  padding: 20px; 
 } 

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By default, list items are displayed vertically. In this example, we use display: inline-block to display them horizontally (side by side).

Note: If you resize the browser window, the links will automatically pause when the content is longer than the web width.

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