w3cschool实战答案

关于HTML最快入门的方法估计就是把W3Cschool的实战编程做一遍吧
实战传送门
下面是所有题目的答案 想快速查找你要的答案 请使用Ctrl + F

开始学习HTML标签

<h1>Hello World</h1>

HTML 学习h2标签

<h1>Hello World</h1>

<h2>CatPhotoApp</h2>

HTML 学习p标签

<h1>Hello World</h1>
<h2>你好html</h2>
<p>Hello Paragraph</p>

删除HTML的注释

<h1>Hello World</h1>

<h2>你好html</h2>

<p>Hello Paragraph</p>

HTML注释语句学习

<!--
<h1>Hello World</h1>
-->
<h2>html编程入门教程</h2>
<!--
<p>Hello Paragraph</p>
-->

HTML用占位符文本填补空白

<h1>西游记</h1>

<h2>齐天大圣</h2>

<h2>孙悟空</h2>

<p>Monkey code 猴哥猴哥，你真了不得，五行大山压不住你，蹦出个孙行者。</p>

删除HTML标签

<h2>编程入门教程</h2>

<p>在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>

HTML 更换文本的颜色

<h2 style="color:red">html编程入门教程</h2>

<p>在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>

使用CSS选择器定义标签

<style>
    h2{
        color: blue;
      }
</style>
<h2>html编程入门教程</h2>

<p>在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>

使用一个CSS Class去给标签定义Style

<style>
.red-text{
    color: red;
}
</style>

<h2 class="red-text">html编程入门教程</h2>

<p>在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>

HTML 为多个元素使用CSS类定义样式

<style>
.red-text {
color: red;
}
</style>

<h2 class="red-text">html编程入门教程</h2>

<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>

HTML 设置标签的字体大小

<style>
  .red-text {
    color: red;
  }
  p{
      font-size: 30px;
  }
</style>

<h2 class="red-text">我家的猫咪</h2>

<p class="red-text">在大家心目中，猫是慵懒的可爱的化身，它可以睡饱了再起来吃饭，可以逗趣小耗子，可以卖得了萌，使得了坏，这样百变的小怪兽就集结在一只宠物上，怎能不惹人怜爱。</p>
<p>
    养动物有的时候，就是介于爱与恨之间，当你钦羡别人萌宠这么可爱的时候，你一定没有想过，狗狗和猫猫会到处拉屎，甚至会屯老鼠，啃鞋子，用爪子爬门，你不理它，它就挠你，你要对它发脾气，它会比你更来劲。所以，狗猫慎入，没有一定的准备，切勿随便去侍养动物。它们一旦认定你了，你就是它们的主人，如果你抛弃它们，它们必定心中重创。
</p>

HTML 设置标签的字体样式

<style>
.red-text {
color: red;
}
.Monospace {
    font-family: Monospace
}
p {
font-size: 16px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>
<p class="Monospace">可以学习的编程语言有很多，我们这个编程训练营里面有大量的编程实战实验，包括Html、css、Javascript、jquery、bootstrap等等前端编程实战课程，请大家耐心按阶段不断向前学习和通过一轮一轮的挑战，相信很快您的编程技术会得到很大的提升，为找到一份好的编程工作做好准备。</p>

引入Google字体

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">

<style>
.red-text {
color: red;
}
h2{
    font-family: Lobster;
}
p {
font-size: 16px;
font-family: Monospace;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>
<p class="red-text">可以学习的编程语言有很多，我们这个编程训练营里面有大量的编程实战实验，包括Html、css、Javascript、jquery、bootstrap等等前端编程实战课程，请大家耐心按阶段不断向前学习和通过一轮一轮的挑战，相信很快您的编程技术会得到很大的提升，为找到一份好的编程工作做好准备。</p>

HTML 处理多个字体降级

<!--<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">-->
<style>
.red-text {
color: red;
}
h2 {
font-family: Lobster, Monospace;
}
p {
font-size: 16px;
font-family: Monospace;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>
<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>
<p class="red-text">可以学习的编程语言有很多，我们这个编程训练营里面有大量的编程实战实验，包括Html、css、Javascript、jquery、bootstrap等等前端编程实战课程，请大家耐心按阶段不断向前学习和通过一轮一轮的挑战，相信很快您的编程技术会得到很大的提升，为找到一份好的编程工作做好准备。</p>

HTML 给页面添加图片

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}
</style>
<img src='/statics/codecamp/images/relaxing-cat.jpg' alt="这里应该有个图片">
<h2 class="red-text">html编程入门教程</h2>

<p class="red-text">猫咪猫咪我就喜欢你</p>
<p class="red-text">深深地爱上你</p>
<p class="red-text">没有理由没有原因</p>
<p class="red-text">从见到你的那一天起</p>
<p class="red-text">你知道我在等你吗?</p>
<p class="red-text">你如果真的在乎我</p>
<p class="red-text">又怎会让无尽的夜陪我度过</p>
<p class="red-text">猫咪猫咪我就喜欢你</p>
<p class="red-text">深深地爱上你</p>
<p class="red-text">在黑夜里倾听你的声音</p>

HTML 调整网页里图片大小

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.smaller-image{
    width: 100px
}

.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}


</style>

<h2 class="red-text">CatPhotoApp</h2>

<img class="smaller-image" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg" >

<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>
<p class="red-text">可以学习的编程语言有很多，我们这个编程训练营里面有大量的编程实战实验，包括Html、css、Javascript、jquery、bootstrap等等前端编程实战课程，请大家耐心按阶段不断向前学习和通过一轮一轮的挑战，相信很快您的编程技术会得到很大的提升，为找到一份好的编程工作做好准备。</p>

HTML 给标签增加边框

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.smaller-image {
width: 100px;
}
.thick-green-border {
  border-width:10px;
  border-style:solid;
  border-color:green;   
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<img class="smaller-image thick-green-border" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg">

<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>
<p class="red-text">可以学习的编程语言有很多，我们这个编程训练营里面有大量的编程实战实验，包括Html、css、Javascript、jquery、bootstrap等等前端编程实战课程，请大家耐心按阶段不断向前学习和通过一轮一轮的挑战，相信很快您的编程技术会得到很大的提升，为找到一份好的编程工作做好准备。</p>

HTML 给标签增加圆角边框

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster,Monospace ;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-radius: 10px;
border-style: solid;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">html编程入门教程</h2>

<img class="smaller-image thick-green-border" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg">

<p class="red-text">我家两岁的小公猫哈哈是个收藏家，臭鱼烂虾，鸡头猪手，无所不爱。清晨我还在睡梦中，突然觉得胸口一沉，恍惚中意识到哈哈又跑到我身上来撒娇，心里不由得滚起温暖的热流，拉过哈哈一把从头摸过背，小家伙顺势想往被子里钻，我一边拒绝着一边往上拉被子，突然脚下一凉，烂泥一样挂在我的大脚趾上的是一块垃圾箱里的鱼头！我顿时睡意全无，换床单洗被罩，天光放亮才勉强收拾妥当。害得我带着熊猫眼跑去上班，一天都没有好心情。实在搞不懂它为什么爱把垃圾叼上床，是故意恶作剧？还是我给的猫粮不够吃？</p>
<p class="red-text">有时候猫会把主人当成自己的孩子(听起来有点令人窝心)，这种行为是在给家里带来猎物。它把自己看成是家里的顶梁柱，有责任给不争气的主人找来食物——猫咪通过长时间对你的观察，沉痛地发现你不会打猎。经常出门的猫咪会把它逮到的老鼠、小鸟带回家里，不出门的就经常翻翻垃圾箱找点东西给你。这个时候，主人可不要责骂它，不然它会认为你对它带回来的食物不满意，下次去找更了不起的东西带回来，放在房间里最显眼的地方。但如果你看见它往家里运输死老鼠，最好也别谢它，别让它觉得你对这种猎物很满意，下次照单带回来。最好的办法是心里感念着猫咪所为你做的，并默默地收拾好一切。</p>

HTML 给图像设置圆角边框

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 10px;
}

.smaller-image {
width: 100px;
border-radius:50%;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<img class="smaller-image thick-green-border" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg">

<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>
<p class="red-text">可以学习的编程语言有很多，我们这个编程训练营里面有大量的编程实战实验，包括Html、css、Javascript、jquery、bootstrap等等前端编程实战课程，请大家耐心按阶段不断向前学习和通过一轮一轮的挑战，相信很快您的编程技术会得到很大的提升，为找到一份好的编程工作做好准备。</p>

HTML 设置链接锚元素外部页面

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
    width: 128px;
    background-size: cover;
    border-radius: 200px;
    box-shadow: 0px 0px 40px rgba(63, 81, 181, 0.72);
    border: 3px solid #00a0ff;
    opacity: 1;
    margin: 0 auto;
    margin-top: 20px;
	margin-bottom: 20px;
	transition: all 1.0s;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text"><a href="http://freecatphotoapp.com">cat photos</a>App</h2>

<img class="smaller-image thick-green-border" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg">


<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>
<p class="red-text">可以学习的编程语言有很多，我们这个编程训练营里面有大量的编程实战实验，包括Html、css、Javascript、jquery、bootstrap等等前端编程实战课程，请大家耐心按阶段不断向前学习和通过一轮一轮的挑战，相信很快您的编程技术会得到很大的提升，为找到一份好的编程工作做好准备。</p>

HTML 在p标签内设置锚链接

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<p>View more <a href="https://www.w3cschool.cn"></a>suibianshudianshenme</p>
<h2 class="red-text">CatPhotoApp</h2>

<a href="https://www.w3cschool.cn">cat photos</a>

<img class="smaller-image thick-green-border" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg">

<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>
<p class="red-text">可以学习的编程语言有很多，我们这个编程训练营里面有大量的编程实战实验，包括Html、css、Javascript、jquery、bootstrap等等前端编程实战课程，请大家耐心按阶段不断向前学习和通过一轮一轮的挑战，相信很快您的编程技术会得到很大的提升，为找到一份好的编程工作做好准备。</p>

HTML 使用#符号设置固定链接

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href=#>cat photos</a>.</p>

<img class="smaller-image thick-green-border" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg">

<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>
<p class="red-text">可以学习的编程语言有很多，我们这个编程训练营里面有大量的编程实战实验，包括Html、css、Javascript、jquery、bootstrap等等前端编程实战课程，请大家耐心按阶段不断向前学习和通过一轮一轮的挑战，相信很快您的编程技术会得到很大的提升，为找到一份好的编程工作做好准备。</p>

HTML 为图片设置超链接

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>


<p>Click here for <a href="#">cat photos</a>.</p>

<a href='#'><img class="smaller-image thick-green-border" src="/statics/codecamp/images/relaxing-cat.jpg"></a>

<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>
<p class="red-text">可以学习的编程语言有很多，我们这个编程训练营里面有大量的编程实战实验，包括Html、css、Javascript、jquery、bootstrap等等前端编程实战课程，请大家耐心按阶段不断向前学习和通过一轮一轮的挑战，相信很快您的编程技术会得到很大的提升，为找到一份好的编程工作做好准备。</p>

HTML 为图片添加alt描述

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg" alt="A cute orange cat lying on its back"></a>

<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>
<p class="red-text">可以学习的编程语言有很多，我们这个编程训练营里面有大量的编程实战实验，包括Html、css、Javascript、jquery、bootstrap等等前端编程实战课程，请大家耐心按阶段不断向前学习和通过一轮一轮的挑战，相信很快您的编程技术会得到很大的提升，为找到一份好的编程工作做好准备。</p>

HTML 创建项目符号无序列表

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>
<ul>
    <li>mike</li>
    <li>cheese</li>
    <li>mike</li>
</ul>

<p class="red-text">在大家心目中，也许编程是一件非常困难的事情，其实也是一件非常有乐趣的事情，只要掌握好编程入门的方法，就能慢慢进入一个全新的创造世界。</p>
<p class="red-text">可以学习的编程语言有很多，我们这个编程训练营里面有大量的编程实战实验，包括Html、css、Javascript、jquery、bootstrap等等前端编程实战课程，请大家耐心按阶段不断向前学习和通过一轮一轮的挑战，相信很快您的编程技术会得到很大的提升，为找到一份好的编程工作做好准备。</p>

HTML 创建有序列表

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>

<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
    <li>12</li>
    <li>12</li>
    <li>12</li>
</ol>

HTML 创建文本输入框

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<input type="text">
<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>
<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>

HTML 为文本输入框设定预定值

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<input type="text" placeholder="cat photo URL">
<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>

<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>
<input type="text">

HTML 添加表单

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>

<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>
<form action="/submit-cat-photo"><input type="text" placeholder="cat photo URL"></form>

HTML 为表单添加提交按钮

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>

<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>
<form action="/submit-cat-photo">
<input type="text" placeholder="cat photo URL">
<button type="submit">Submit</button>
</form>

HTML 使用HTML5技术把表单设置为必填

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>

<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>
<form action="/submit-cat-photo">
<input type="text" placeholder="cat photo URL" required>
<button type="submit">Submit</button>
</form>

HTML 添加单选框

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
    width: 128px;
    background-size: cover;
    border-radius: 200px;
    box-shadow: 0px 0px 40px rgba(63, 81, 181, 0.72);
    border: 3px solid #00a0ff;
    opacity: 1;
    margin: 0 auto;
    margin-top: 20px;
	margin-bottom: 20px;
	transition: all 1.0s;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>

<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>
<form action="/submit-cat-photo">
<label><input type="radio" name="indoor-outdoor"> Indoor</label>
<label><input type="radio" name="indoor-outdoor"> Outdoor</label>
<button type="submit">Submit</button>
</form>

HTML 添加复选框

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>

<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>
<form action="/submit-cat-photo">
<label><input type="checkbox"  name="personality"> Indoor</label>
<label><input type="checkbox"  name="personality"> Outdoor</label>
<label><input type="checkbox"  name="personality"> personality</label>
<input type="text" placeholder="cat photo URL" required>
<button type="submit">Submit</button>
</form>

HTML 使用checked属性设置复选框和单选框默认被选中

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>

<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>
<form action="/submit-cat-photo">
<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
<label><input type="radio" name="indoor-outdoor"> Outdoor</label>
<label><input type="checkbox" name="personality" checked> Loving</label>
<label><input type="checkbox" name="personality"> Lazy</label>
<label><input type="checkbox" name="personality"> Energetic</label>
<input type="text" placeholder="cat photo URL" required>
<button type="submit">Submit</button>
</form>

HTML 在div元素中嵌套多个元素

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>
<div>
<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>
</div>
<form action="/submit-cat-photo">
<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
<label><input type="radio" name="indoor-outdoor"> Outdoor</label>
<label><input type="checkbox" name="personality" checked> Loving</label>
<label><input type="checkbox" name="personality"> Lazy</label>
<label><input type="checkbox" name="personality"> Energetic</label>
<input type="text" placeholder="cat photo URL" required>
<button type="submit">Submit</button>
</form>

HTML 为div元素设置背景颜色

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>

.gray-background{
    background-color: gray;
}
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>

<div class="gray-background">
<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>
</div>

<form action="/submit-cat-photo">
<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
<label><input type="radio" name="indoor-outdoor"> Outdoor</label>
<label><input type="checkbox" name="personality" checked> Loving</label>
<label><input type="checkbox" name="personality"> Lazy</label>
<label><input type="checkbox" name="personality"> Energetic</label>
<input type="text" placeholder="cat photo URL" required>
<button type="submit">Submit</button>
</form>

HTML 为标签添加ID属性

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}
.gray-background {
background-color: gray;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>

<div class="gray-background">
<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>
</div>

<form id='cat-photo-form' action="/submit-cat-photo">
<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
<label><input type="radio" name="indoor-outdoor"> Outdoor</label>
<label><input type="checkbox" name="personality" checked> Loving</label>
<label><input type="checkbox" name="personality"> Lazy</label>
<label><input type="checkbox" name="personality"> Energetic</label>
<input type="text" placeholder="cat photo URL" required>
<button type="submit">Submit</button>
</form>

HTML 使用ID属性设置标签样式

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}

h2 {
font-family: Lobster, Monospace;
}

p {
font-size: 16px;
font-family: Monospace;
}

#cat-photo-form{
    background-color: green
}

.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}

.smaller-image {
width: 100px;
}

.gray-background {
background-color: gray;
}
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back" src="https://www.w3cschool.cn/statics/codecamp/images/relaxing-cat.jpg"></a>

<div class="gray-background">
<p>Things cats love:</p>
<ul>
<li>cat nip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>
</div>

<form action="/submit-cat-photo" id="cat-photo-form">
<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
<label><input type="radio" name="indoor-outdoor"> Outdoor</label>
<label><input type="checkbox" name="personality" checked> Loving</label>
<label><input type="checkbox" name="personality"> Lazy</label>
<label><input type="checkbox" name="personality"> Energetic</label>
<input type="text" placeholder="cat photo URL" required>
<button type="submit">Submit</button>
</form>

HTML 使用padding布局页面标签

<style>
.injected-text {
margin-bottom: -25px;
text-align: center;
}

.box {
border-style: solid;
border-color: black;
border-width: 5px;
text-align: center;
}

.yellow-box {
background-color: yellow;
padding: 10px;
}

.red-box {
background-color: red;
padding: 20px;
}

.green-box {
background-color: green;
padding: 20px;
}
</style>
<h5 class="injected-text">margin</h5>

<div class="box yellow-box">
<h5 class="box red-box">padding</h5>
<h5 class="box green-box">padding</h5>
</div>

HTML 使用margin布局页面标签

<style>
.injected-text {
margin-bottom: -25px;
text-align: center;
}

.box {
border-style: solid;
border-color: black;
border-width: 5px;
text-align: center;
}

.yellow-box {
background-color: yellow;
padding: 10px;
}

.red-box {
background-color: red;
padding: 20px;
margin: 20px;
}

.green-box {
background-color: green;
padding: 20px;
margin: 20px;
}
</style>
<h5 class="injected-text">margin</h5>

<div class="box yellow-box">
<h5 class="box red-box">padding</h5>
<h5 class="box green-box">padding</h5>
</div>

HTML 使用负值设置页面元素的margin属性

<style>
.injected-text {
margin-bottom: -25px;
text-align: center;
}

.box {
border-style: solid;
border-color: black;
border-width: 5px;
text-align: center;
}

.yellow-box {
background-color: yellow;
padding: 10px;
}

.red-box {
background-color: red;
padding: 20px;
margin: -15px;
}

.green-box {
background-color: green;
padding: 20px;
margin: -15px;
}
</style>

<div class="box yellow-box">
<h5 class="box red-box">padding</h5>
<h5 class="box green-box">padding</h5>
</div>

HTML 为不同方向padding设置不同的值

<style>
.injected-text {
margin-bottom: -25px;
text-align: center;
}

.box {
border-style: solid;
border-color: black;
border-width: 5px;
text-align: center;
}

.yellow-box {
background-color: yellow;
padding: 10px;
}

.red-box {
background-color: red;
padding-top: 40px;
padding-right: 20px;
padding-bottom: 20px;
padding-left: 40px;
}

.green-box {
background-color: green;
padding-top: 40px;
padding-right: 20px;
padding-bottom: 20px;
padding-left: 40px;
}
</style>
<h5 class="injected-text">margin</h5>

<div class="box yellow-box">
<h5 class="box red-box">padding</h5>
<h5 class="box green-box">padding</h5>
</div>

HTML 为不同方向margin设置不同的值

<style>
.injected-text {
margin-bottom: -25px;
text-align: center;
}

.box {
border-style: solid;
border-color: black;
border-width: 5px;
text-align: center;
}

.yellow-box {
background-color: yellow;
padding: 10px;
}

.red-box {
background-color: red;
margin-top: 40px;
margin-right: 20px;
margin-bottom: 20px;
margin-left: 40px;
}

.green-box {
background-color: green;
margin-top: 40px;
margin-right: 20px;
margin-bottom: 20px;
margin-left: 40px;
}
</style>
<h5 class="injected-text">margin</h5>

<div class="box yellow-box">
<h5 class="box red-box">padding</h5>
<h5 class="box green-box">padding</h5>
</div>

HTML CSS中padding简写

<style>
.injected-text {
margin-bottom: -25px;
text-align: center;
}

.box {
border-style: solid;
border-color: black;
border-width: 5px;
text-align: center;
}

.yellow-box {
background-color: yellow;
padding: 20px 40px 20px 40px;
}

.red-box {
background-color: red;
padding: 20px 40px 20px 40px;
}

.green-box {
background-color: green;
padding: 40px 20px 20px 40px;
}
</style>
<h5 class="injected-text">margin</h5>

<div class="box yellow-box">
<h5 class="box red-box">padding</h5>
<h5 class="box green-box">padding</h5>
</div>

HTML CSS中margin简写

<style>
.injected-text {
margin-bottom: -25px;
text-align: center;
}

.box {
border-style: solid;
border-color: black;
border-width: 5px;
text-align: center;
}

.yellow-box {
background-color: yellow;
padding: 20px 40px 20px 40px;
}

.red-box {
background-color: red;
margin: 20px 40px 20px 40px;
}

.green-box {
background-color: green;
margin: 40px 20px 20px 40px
}
</style>
<h5 class="injected-text">margin</h5>

<div class="box yellow-box">
<h5 class="box red-box">padding</h5>
<h5 class="box green-box">padding</h5>
</div>

CSS 样式的继承

<style>
body {
    background-color: black
}

</style>

CSS 继承Body元素样式

<style>
body {
color: green;
font-family: Monospace
}

</style>
<h1 >Hello World</h1>

CSS 样式的覆盖

<style>
body {
background-color: black;
font-family: Monospace;
color: green;
}
.pink-text{
    color: pink;
}
</style>
<h1 class="pink-text">Hello World!</h1>

CSS 多个class处理样式覆盖

<style>
body {
background-color: black;
font-family: Monospace;
color: green;
}
.pink-text {
color: pink;
}
.blue-text{
    color: blue;
}
</style>
<h1 class="pink-text blue-text">Hello World!</h1>

CSS 通过ID的样式属性覆盖class类的声明

<style>
body {
background-color: black;
font-family: Monospace;
color: green;
}
.pink-text {
color: pink;
}
.blue-text {
color: blue;
}

#orange-text {    
  color: orange;    
}

</style>
<h1 class="pink-text blue-text" id="orange-text">Hello World!</h1>

CSS 通过内联样式覆盖class类的声明

<style>
body {
background-color: black;
font-family: Monospace;
color: green;
}
#orange-text {
color: orange;
}
.pink-text {
color: pink;
}
.blue-text {
color: blue;
}

</style>
<h1 style="color:white;" id="orange-text" class="pink-text blue-text" >Hello World!</h1>

CSS 通过使用Important覆盖所有其他样式

<style>
body {
background-color: black;
font-family: Monospace;
color: green;
}
#orange-text {
color: orange;
}
.pink-text {
color: pink !important;
}
.blue-text {
color: blue;
}
</style>
<h1 id="orange-text" class="pink-text blue-text" style="color: white">Hello World!</h1>

CSS 通过使用十六进制代码设置特定的颜色

<style>
body {
background-color: #000000;
}
</style>

CSS 十六进制白色表达方式

<style>
body {
background-color: #FFFFFF;
}
</style>

CSS 十六进制RGB红色表达方

<style>
body {
background-color: #FF0000;
}
</style>

CSS 使用rgb属性设定混合颜色

<style>
body {
background-color: rgb(255, 165, 0);
}
</style>