How to set position in html

In web development, HTML (Hypertext Markup Language) is the most basic language. It provides structure and content to web pages and allows developers to add various elements such as text, images, and links. However, these elements need to be placed in the right place to provide the best user experience and aesthetics.

Next, we will discuss how to set the position of elements in HTML, which attributes can be used and common mistakes that should be avoided.

1. Use CSS styles

CSS (Cascading Style Sheets) is a language used to beautify HTML. It provides various style attributes that help developers set the position of elements, such as "position", "left", "right", "top" and "bottom".

1. "position" attribute

The position of an element can be set through the position attribute. It has four values ​​available: static, relative, absolute and fixed.

• static is the default value and the element will be placed where it is in the HTML. If no other properties change the default width of a block-level element (such as a div), then it will take up all available width of its parent container.
• relative is to set the position relative to the element's position in HTML. Use the left, right, top, and bottom values ​​to move an element to the left, right, top, or bottom relative to its default position.
• absolute positions an element relative to its nearest positioned parent element. If there are no positioned elements in its ancestors, the element will be positioned relative to the HTML's initial coordinates. Elements can be positioned anywhere on the page using the left, right, top, and bottom values.
• fixed causes an element to remain in a fixed position when scrolled over a specific position in the viewport. It can be used with the left, right, top, and bottom properties to position elements relative to the viewport.

2. The "left", "right", "top" and "bottom" attributes

These attributes are almost always used in conjunction with the position attribute. They represent the horizontal and vertical offset of an element relative to its parent container or viewport. Values ​​on the left and up sides will move the element left and up, while values ​​on the right and down sides will move the element right and down.

2. Use tables

You can also set the position of elements using HTML tables. A table consists of a series of rows and columns, and content can be inserted into cells using the td and th elements.

In the table, you can use the horizontal alignment and vertical alignment properties to place content as follows:

<table>
  <tr>
    <td align="center" valign="middle">居中</td>
    <td align="left" valign="bottom">左下角</td>
    <td align="right" valign="top">右上角</td>
  </tr>
</table>

3. Avoid common mistakes

• Don’t just use pixel values. Because different screen sizes, resolutions and devices may affect the display of web pages. When setting element position, you should use percentage or em values.
• Do not use tables to lay out the entire web page. Tables are meant to display data with rows and columns, and don't handle layout issues well.
• Don't use hardcoded locations. Web design should be able to adapt to various screen sizes. For this purpose, CSS flex layout properties such as flexbox and grid layout should be used.

HTML is the most basic language when developing web pages. Knowing how to position elements and use the correct layout methods will ensure that your web pages adapt to various screen sizes, thereby improving your website's user experience and traffic.

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