cool hit counter HTML Lesson 5 - css box model_Intefrankly

HTML Lesson 5 - css box model

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Straight to code.

<!doctype html>
        <meta charset="utf-8" />
        <meta name="keywords" content=" byword, byword" />
        <meta name="description" content="" />
        <link rel="stylesheet" href="css/index.css" />
        <div> mycss Box test model</div>

The above code is not difficult to write, it just writes adiv The label, as you already know.div Tags are block-level elements, so they take up a full line of.

But we also notice that there are actually some gaps on the left side of the picture: the

This gap is not expected to exist, and this gap is basically where the `margin` or `padding` or `border` comes in.

Let's look at the right side of the developer tools.

There's one on{} There is one underneathdiv attribute of the tag, the defaultdisplay: block . What's the top one for? Let's modify the code.

<div style="border: 1px solid red"> mycss Box test model</div>

Then refresh the page to see.

That's how we know that It's the properties that we write in the code. But we don't usually write it that way, which means that people write code that puts all the properties in thecss file for good, don't let There is any content.

There is also a box below.

This box is the specific properties of this current css box, such as width and other information.

  • margin: outer margin
  • border: border
  • padding: inner margin

This means that the size of a complete box model is determined by the values of these three parameters together. Now we modify the code.


<div id="mydiv"> mycss Box test model</div>

The original code remains the same, just give thediv Add



    width: 100px;
    height: 100px;    
    background-color: #000;    

We then refresh the page to.

The following box areas will change accordingly.

We see that the content area size has changed to100*100 whereaspadding、border、margin All are 0. Let's modify these three values and see the effect.


    width: 100px;    
    height: 100px;    
    background-color: #000;    
    padding: 10px;

The size of the box was changed from the original100*100 change into120*120 Up.

paddingfor the inner margin, we see that the text is 10 pixels away from the edge: the

As you can see from the picture above.padding The attributes are also divided into top and bottom, so thispadding It's actually divided intopadding-left、padding-right、padding-top、padding-bottom

If the margins were different in all four directions, it would be a bit too cumbersome for us to write four, so we could write it like this

padding: 10px 20px 30px 40px;

As you can see, the four values represent, from left to right: top, right, bottom, and left, which means counterclockwise Walk the margins. Whenever it is written in this way, it is this clockwise representation.

If you write

padding: 10px 20px;

It would represent 10px up and down and 20px left and right.

You'll see these when you try them.

border Represents the border.

    width: 100px;    
    height: 100px;    
    background-color: #000;    
    padding: 10px 20px;    
    border: 10px solid red;

border: 10px solid red; Represents 10 pixels, solid line, and red for both top and bottom. If you want the four borders to be different you'll have to write them one by one:.

    width: 100px;    
    height: 100px;    
    background-color: #000;    
    padding: 10px 20px;    
    border-top: 10px solid #f00;    
    border-left: 10px solid #0f0;    
    border-right: 10px solid #00f;    
    border-bottom: 10px solid #bbb;

The box size will also change with the addition of the border.

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