html settings (-)

HTML is one of the most important languages ​​​​in web page production, which can determine the layout and layout of web pages. In HTML, we can set the attributes of various elements to control the display effect of web pages. One of the ways to set properties is to use the "-" symbol.

1. The "-" in the CSS attribute name

CSS is a style sheet language used to beautify web pages. Like the HTML language, the "-" symbol is also used to separate words. Describes the value of a composite attribute.

For example, the background color attribute can be written as "background-color" and the font size can be written as "font-size". This way of writing is called "hyphen naming" in CSS and helps improve the readability of attribute names.

2. Custom data attributes

In HTML5, we can use the "data-" prefix to customize data attributes to add custom attributes to HTML elements so that we can read them in JavaScript. Get and operate on the data of this element.

For example, we can add data-* attributes to HTML elements to store custom information related to the element, such as the article id, publication time, etc.

HTML code:

<div id="article-123" data-time="2020-12-01">
  <h2 id="文章标题">文章标题</h2>
  <p>文章内容</p>
</div>

JavaScript code:

const article = document.getElementById('article-123');
console.log(article.dataset.time); // 2020-12-01

3. Input box type

In HTML, we can set the type attribute of the input element , to specify the type of input box. Commonly used input box types include text boxes, password boxes, radio buttons, check boxes, submit buttons, etc.

For example, we can set type to "text" to create a text input box, and set type to "password" to create a password input box. At the same time, we can also set multiple multi-select boxes with the same name attribute to realize the multi-select function.

HTML code:

<form>
  <label for="username">用户名: </label>
  <input type="text" id="username" name="username"><br>

  <label for="password">密码: </label>
  <input type="password" id="password" name="password"><br>

  <label for="gender-male">男: </label>
  <input type="radio" id="gender-male" name="gender" value="male">

  <label for="gender-female">女: </label>
  <input type="radio" id="gender-female" name="gender" value="female"><br>

  <label for="fruits">选择水果: </label>
  <input type="checkbox" name="fruits" value="apple">苹果
  <input type="checkbox" name="fruits" value="banana">香蕉
  <input type="checkbox" name="fruits" value="orange">橙子<br>

  <input type="submit" value="提交">
</form>

4. Connectors in the URL

In the URL, we use the "-" symbol or the "_" symbol to replace spaces for convenience Search engines correctly parse keywords in URLs. At the same time, we can also use the "-" symbol instead of the "/" symbol to simplify the URL path.

5. Summary

In HTML, using the "-" symbol can help us set CSS properties, custom data properties, input box types and URL connectors, and improve the efficiency and efficiency of web page production. readability. Equally important, we need to comply with HTML standards and semantics to provide users with a better browsing experience.

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