Checkbox should be a relatively common HTML function, but the checkbox that comes with the browser is often not very good-looking, and the effects are different in different browsers. Out of the need to beautify and unify visual effects, the customization of checkbox was proposed. This article mainly shares with you the effect of CSS+HTML custom checkbox. Let’s take a look. I hope it can help you.
Implementation ideas
The main means of pure CSS implementation is to use the simulation function of the label tag. The for attribute of label can be associated with a specific input element. Even if the input itself is not visible to the user, after there is a label corresponding to it, the user can directly replace the native input by interacting with the label label - and this gives us Style simulation leaves room. In short, it is
Hide the native input and leave the style definition process to the label (then why not directly change the style of the checkbox? Because checkbox is the default component of the browser, style changes are not as convenient as label, many Attributes have no effect on checkboxes, such as background, and label is basically the same as p in style. "The existence of " allows us to directly use the default checkbox of html, eliminating the trouble of js simulation selection.
<p> <!-- `input`的id必须有,这个是label进行元素匹配所必需的 --> <!-- 可以看到每个input的id和label的“for”属性对应同一字符串 --> <input> <label></label> <input> <label></label> <input> <label></label> <input> <label></label></p>HTML construction is completed, next is the corresponding css.
.wrap { width: 500px; background-color: #EEE; border: 2px solid #DEF; } /* 隐藏所有checkbox */ input[type='checkbox'] { display: none; } /* 对label进行模拟.背景图片随便拼凑的,不要吐槽品味*/ /* transition效果是做个背景切换效果,这里单纯演示而已,实际上这个过渡不加更自然*/ label { display: inline-block; width: 60px; height: 60px; position: relative; background: url(//www.chitanda.me/images/blank.png); background-position: 0 0px; -webkit-transition: background 0.5s linear; } /* 利用相邻选择符和checkbox`:checked`的状态伪类来模拟默认选中效果(就是点击后那个勾号的效果) */ /*如果这段代码注释,点击后将没有任何反馈给用户*/ /*因为label本身是没有点击后被选中的状态的,checkbox被隐藏后,这个状态只能手动模拟*/ input[type='checkbox']:checked+label { background-position: 0 -60px; }The effect of the above code is as follows, and it seems to be OK. But if you think about it carefully, it seems that something is missing: the prompt text corresponding to the optionThe first reaction of newcomers who don’t know CSS at this time is to use the p tag or span tag after the label. to add text. But this approach is not very elegant. Personally, I recommend using CSS’s ::before and ::after pseudo-elements (::before and :before are the same thing. However, in order to distinguish “pseudo-elements” from “pseudo-classes”, the W3C recommended writing method is to use :: for pseudo-elements). And pseudo-classes are used:)
I won’t go into details about the specific content of pseudo-elements here (in fact, my knowledge of them is limited to their use. I can’t even understand this, so I won’t mislead others)
/* 伪元素的生效很简单,定义`content`就好,其余的属性和普通p一样 */ label::after { content: attr(data-name); /*利用attr可以减少css代码量,data-name写在html部分的label属性里*/ display: inline-block; position: relative; width: 120px; height: 60px; left: 100%; vertical-align: middle; margin: 10px; }Of course, since you can use ::after to simulate the label's text, you can also use ::before to simulate the label's checkbox style, which will not be analyzed here. Related recommendations:
Pure Css code to beautify checkbox checkbox, radios radio button and sliding button simple method
jQuery operation Detailed explanation of CheckBox method examples
About checkBox selected style setting in html
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本篇文章带大家了解一下HTML(超文本标记语言),介绍一下HTML的本质,HTML文档的结构、HTML文档的基本标签和图像标签、列表、表格标签、媒体元素、表单,希望对大家有所帮助!

不算。html是一种用来告知浏览器如何组织页面的标记语言,而CSS是一种用来表现HTML或XML等文件样式的样式设计语言;html和css不具备很强的逻辑性和流程控制功能,缺乏灵活性,且html和css不能按照人类的设计对一件工作进行重复的循环,直至得到让人类满意的答案。

总结了一些web前端面试(笔试)题分享给大家,本篇文章就先给大家分享HTML部分的笔试题(附答案),大家可以自己做做,看看能答对几个!

HTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制,它只是一个矩形的图形容器,绘制图形必须通过脚本(通常是JavaScript)来完成;开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。

html5废弃了dir列表标签。dir标签被用来定义目录列表,一般和li标签配合使用,在dir标签对中通过li标签来设置列表项,语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir,可使用ul标签取代。

在html中,document是文档对象的意思,代表浏览器窗口的文档;document对象是window对象的子对象,所以可通过“window.document”属性对其进行访问,每个载入浏览器的HTML文档都会成为Document对象。

html5支持boolean值属性;boolean值属性指是属性值为true或者false的属性,如input元素中的disabled属性,不使用该属性表示值为flase,不禁用元素,使用该属性可以不设置属性值表示值为true,禁用元素。


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