create accordion with just 3 lines of code no libraries needed

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creating a simple accordion component with just html, css, and a bit of javascript is quite straightforward. here’s a tutorial on how to do it in just three lines of javascript code, without using any libraries.

step 1: html structure

first, we need to set up the html structure for the accordion. an accordion typically consists of a header that can be clicked to reveal or hide content.

```html
!doctype html
html lang="en"
head
meta charset="utf-8"
meta name="viewport" content="width=device-width, initial-scale=1.0"
titlesimple accordion/title
style
.accordion {
cursor: pointer;
padding: 10px;
border: 1px solid ccc;
margin: 5px 0;
background-color: f1f1f1;
}

.panel {
padding: 0 10px;
max-height: 0;
overflow: hidden;
transition: max-height 0.2s ease-out;
background-color: white;
}
/style
/head
body
div class="accordion"section 1/div
div class="panel"
pthis is the content of section 1./p
/div

div class="accordion"section 2/div
div class="panel"
pthis is the content of section 2./p
/div

div class="accordion"section 3/div
div class="panel"
pthis is the content of section 3./p
/div

script
// step 2: javascript for accordion functionality
document.queryselectorall('.accordion').foreach(a = a.addeventlistener('click', function() {
this.classlist.toggle('active');
const panel = this.nextelementsibling;
panel.style.maxheight = panel.style.maxheight ? null : panel.scrollheight + "px";
}));
/script
/body
/html
```

explanation

1. **html structure**:
- each accordion section consists of a `div` with the class `accordion` for the clickable header and another `div` with the class `panel` for the content that ...

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accordion
HTML
CSS
JavaScript
lightweight
code snippet
tutorial
collapsible sections
responsive design
user interface
simple implementation
vanilla JavaScript
frontend development
interactive elements
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