Skip to main content

What is the difference between width property 100% and auto in css?

 width:auto: The default width value of block-level elements. When set to this value, the browser will automatically select an appropriate width value to adapt to the width of the parent element. When the width is set to 100%, the width of the child element box The value is equal to the parent's content, and as the parent's content automatically changes, after adding the padding and margin of the child element, its width remains unchanged, which is the difference from setting it to auto. But we most often use width:auto, because it is more flexible, width:100% is used less, because when adding padding or margin, this method is easy to make it exceed the parent box and destroy the original layout.

The following is the actual code demonstration, the picture intuitively reflects the difference between the two.

<style>
        .outer{
            background-color: aquamarine;
            width: 200px;
            height: 200px;
        }
        .inner1{
            height: 50px;
            width: auto;
            background-color: pink;
            padding: 10px;
            border: 5px solid red;
            margin: 5px;
        }
        .inner2{
            height: 50px;
            width: 100%;
            padding: 10px;
            background-color: yellow;
            border: 5px solid red;
            margin: 5px;
        }
    </style>
</head>
<body>
    <div class="outer">
        <div class="inner1">

        </div>
        <hr>
        <div class="inner2">
           
        </div>
    </div>



Labels:

Comments

Post a Comment

Popular posts from this blog

favicon.ico 404 Not Found Causes and Solutions

 What is favicon? It is the abbreviation of Favorites Icon. Its function is that in addition to displaying the corresponding title in the browser's favorites, icons can also be used to distinguish different websites. When I encounter this kind of error, I feel very uncomfortable. There is obviously no problem. Why is a 404 error reported? The following is the solution.
Post a Comment
Read more

Use of custom events in Vue components.

 The parent component uses props to pass data (such as a method) to the child component, and the child component needs to use custom events to pass data back to the parent component! We can use v-on to bind custom events, and then pass them to subcomponents, which will call after receiving the method. Each Vue instance implements the Events interface, that is: use $on(eventName) to listen for events and $emit(eventName) to trigger events.
Post a Comment
Read more

mapState, mapGetters, mapMutations, mapActions in vuex

 The above four objects are all in the vuex plug-in store, which is often used to store some data shared globally. But I still feel a little uncomfortable when using it, that is, I wrote a lot of repeated prefixes. At this time, these four objects appeared, which solved this pain point very well. mapState is mainly used to manipulate and obtain data, mapGetters is equivalent to computed properties, and mapMutations and mapActions are simplifications of mutation and action. They can be written as both objects and arrays.
Post a Comment
Read more