Flexbox is more suitable for one-dimensional layouts, such as navigation bars and button groups; Grid is more suitable for two-dimensional layouts, such as the overall structure of the page. Flexbox is good at flexible alignment and responsive arrangement of single rows or single columns, suitable for horizontal or vertical centering and internal content layout of cards; Grid supports simultaneous control of rows and columns, suitable for complex page frames, dashboards and other scenarios. Judgment criteria: Flexbox is used for one-dimensional layout, Grid is used for two-dimensional layout; Grid is preferred for multiple independent areas, and Flexbox is used for alignment and sorting dynamic scaling. The two can also be mixed, such as Grid as structure, and internal blocks are arranged using Flexbox. Tips: Grid named areas improve readability, Flex children need to add flex-wrap to wrap, and Grid's auto-fit and minmax() adapt to responsive lists.

When you need to make choices in a CSS layout, Grid and Flexbox each have their own specialties. Simply put: Flexbox is more suitable for one-dimensional layout (such as navigation bars and button groups), while Grid is more suitable for two-dimensional layout (the row and column are controlled simultaneously, such as the entire page structure) .

When to use Flexbox?

The original intention of Flexbox is to solve the problem of element arrangement in a single row or a single column . It is flexible in alignment and easy to handle responsively, making it very efficient in handling internal arrangements of components.

Common usage scenarios include:

• Center horizontally or vertically
• Navigation bar, toolbar
• Form control arrangement
• Card internal content layout

For example: If you want to arrange several children in a div container horizontally and leave a blank space in the middle to evenly distribute it, just write it like this:

 .container {
  display: flex;
  justify-content: space-between;
}

The advantage of Flexbox is its ability to "auto-adjust" and does not require you to manually calculate spacing and position.

When to use CSS Grid?

Grid is designed to solve more complex page structure design, which allows you to accurately control the layout in both row and column dimensions . If you need to build multi-column layouts like the overall web framework, dashboard, and magazine style, then Grid is a better choice.

Typical application scenarios include:

• Overall structure of the page (head, sidebar, main content area, etc.)
• Waterfall flow layout
• Complex UI that requires fixed ranks and queues

For example, to create a three-column and two-row layout, you can define it like this:

 .grid-container {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  grid-template-rows: auto 1fr;
}

You will find that Grid is clearer and more intuitive than nesting multiple Flex containers when controlling the location and size of multiple regions.

How to determine which one to use?

Many times beginners will be confused about which one to choose. In fact, you can remember a few simple judgment criteria:

• If your layout is mainly arranged in a row or column → use Flexbox.
• If you need to control both row and column structure → use Grid.
• If there are multiple independent areas in the layout that need to be positioned (such as header, sidebar, main, footer) → Grid is preferred.
• If it is just aligned, sorted, or dynamically scaling the items in the container → Flexbox is more suitable.

Sometimes it can also be mixed, such as using Grid as the overall structure, and then using Flexbox to arrange content in a certain block.

Tips: Points that novices are easily overlooked

1. Grid supports named regions , which makes the layout structure clearer, such as:

    grid-template-areas:
     "header header"
     "sidebar main"
     "footer footer";

2. The Flex child will not wrap the line by default . If you want it to wrap, remember to add flex-wrap: wrap .

3. Grid's auto-fit and minmax() are very useful in responsive layouts, such as making an adaptive card list:

    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));

   Basically that's it. After understanding their respective strengths, the layout choice will not be too complicated.

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