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 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 box model is a very important concept in CSS layout, it includes content area, padding, border, and margin. Box models can be divided into two types: standard box models and IE box models. The box model, as the name suggests, is used to hold things, and the things it holds are the content of HTML elements. In other words, every visible HTML element is a box.

 This article mainly introduces the method of dynamically binding CSS styles in the Vue framework. By sharing simple examples, we gradually understand the value transfer and binding data in Vue. The introduction is very detailed and has certain reference value. Friends who need it can refer to it. First of all, let's talk about dynamic binding. Relatively, everyone knows static binding. For static binding, you can directly add class="". Dynamic binding must be based on a certain operation of the user to dynamically modify the style, which is more flexible. convenient.