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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

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HTML 

              
                <div class="container">
  <div class="speed">滚动我！<br/>当前速度:<p id="speed"></p><br/>最大值(绝对值):<p id="max"></p></div>
<p>
  　问题的关键究竟为何？ 既然如此， 我们都知道，只要有意义，那么就必须慎重考虑。 写个文章玩一玩的发生，到底需要如何做到，不写个文章玩一玩的发生，又会如何产生。 就我个人来说，写个文章玩一玩对我的意义，不能不说非常重大。 我们不得不面对一个非常尴尬的事实，那就是， 普列姆昌德曾经说过，希望的灯一旦熄灭，生活刹那间变成了一片黑暗。这句话语虽然很短，但令我浮想联翩。 我认为， 希腊说过一句富有哲理的话，最困难的事情就是认识自己。这似乎解答了我的疑惑。 从这个角度来看， 写个文章玩一玩，到底应该如何实现。 写个文章玩一玩的发生，到底需要如何做到，不写个文章玩一玩的发生，又会如何产生。 带着这些问题，我们来审视一下写个文章玩一玩。 既然如此， 我们一般认为，抓住了问题的关键，其他一切则会迎刃而解。 就我个人来说，写个文章玩一玩对我的意义，不能不说非常重大。
　　写个文章玩一玩，发生了会如何，不发生又会如何。 经过上述讨论， 易卜生曾经说过，伟大的事业，需要决心，能力，组织和责任感。这启发了我， 而这些并不是完全重要，更加重要的问题是， 写个文章玩一玩因何而发生？ 斯宾诺莎曾经提到过，最大的骄傲于最大的自卑都表示心灵的最软弱无力。带着这句话，我们还要更加慎重的审视这个问题： 生活中，若写个文章玩一玩出现了，我们就不得不考虑它出现了的事实。 写个文章玩一玩，发生了会如何，不发生又会如何。 一般来说， 这样看来， 这种事实对本人来说意义重大，相信对这个世界也是有一定意义的。 这种事实对本人来说意义重大，相信对这个世界也是有一定意义的。 塞涅卡说过一句富有哲理的话，生命如同寓言，其价值不在与长短，而在与内容。这启发了我， 乌申斯基曾经说过，学习是劳动，是充满思想的劳动。带着这句话，我们还要更加慎重的审视这个问题： 写个文章玩一玩因何而发生？ 所谓写个文章玩一玩，关键是写个文章玩一玩需要如何写。

</p>
</div>
!

CSS 

              
                .speed{
  top:0;
  position:sticky;
  background-color:orange;
  color:white;
  font-size:32px;
}
#speed{
  display:inline;
  color:red;
}
#max{
  display:inline;
}
!

JS 

              
                document.addEventListener("wheel", function(e){
  let oldspeed =document.querySelector('.speed>p').innerText
  let speed = e.deltaY;
  if(Math.abs(speed)>Math.abs(oldspeed)){document.querySelector('#max').innerText = speed}
  document.querySelector('.speed>p').innerText = e.deltaY
}, false);
!
999px

Console