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Thorough explanation of the features and usage of box-sizing!

When coding a website, you may sometimes specify “box-sizing: border-box” in CSS.

Some of you may be using it vaguely, but are unsure if you understand it properly.

This time, we will explain the features and usage of the CSS property box-sizing in an easy-to-understand manner .

Please read to the end!

Table of contents

  • What is box-sizing?
  • When box-sizing doesn’t work?
  • Summary: Specify box-sizing for the whole

What is box-sizing?

CSS box-sizing specifies whether to include padding and border in the width and height of an element .

The initial value is content-box, and it will be specified as “not included” as it is.

If it is not included, when the width of the element is set to 100%, the amount of padding and border will protrude outside.

The total value of the content of the element, padding, and border needs to be adjusted to 100%, which makes it difficult to specify.

A value of border-box specifies inclusion .

When you use box-sizing, you usually want to specify this value.

Another value is inherit. This indicates that the specification of the parent element is inherited.

When box-sizing doesn’t work?

When using box-sizing, it ‘s easier to basically specify it for all elements .

  box-sizing: border-box;

If box-sizing does not work, you may have specified it for individual elements and not managed it well.

Let’s specify the whole and check for spelling mistakes.

Most browsers support box-sizing, so you don’t usually have to worry about it, but it might be a good idea to check if your browser supports it.

Summary: Specify box-sizing for the whole

This time, we have explained the features and usage of the CSS property box-sizing .

I also showed you what to do if it doesn’t work.

I think there were many people who specified it without knowing it.

I hope that this article will be of help to you.


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