The MDN Content Kitchensink

<pre></pre>

const f = () => {
  return Math.random();
};

:root {
  --first-color: #488cff;
  --second-color: #ffff8c;
}

#firstParagraph {
  background-color: var(--first-color);
  color: var(--second-color);
}

(func (param i32) (param f32) (local f64)
  local.get 0
  local.get 1
  local.get 2)

#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }
}

class BookListView(generic.ListView):
    model = Book
    # your own name for the list as a template variable
    context_object_name = 'my_book_list'
    queryset = Book.objects.filter(title__icontains='war')[:5]
    template_name = 'books/my_arbitrary_template_name_list.html'

<p>New Products:</p>
<ul>
  <li><data value="398">Mini Ketchup</data></li>
  <li><data value="399">Jumbo Ketchup</data></li>
  <li><data value="400">Mega Jumbo Ketchup</data></li>
</ul>

data:hover::after {
  content: " (ID " attr(value) ")";
  font-size: 0.7em;
}

const set = new Set();

set.add(42);
set.add("forty two");

const iterator = set[Symbol.iterator]();

console.log(iterator.next().value);
// Expected output: 42

console.log(iterator.next().value);
// Expected output: "forty two"

filter: url("/shared-assets/images/examples/shadow.svg#element-id");

filter: blur(5px);

filter: contrast(200%);

filter: grayscale(80%);

filter: hue-rotate(90deg);

filter: drop-shadow(16px 16px 20px red) invert(75%);

<section id="default-example">
  <div class="example-container">
    <img
      id="example-element"
      src="/shared-assets/images/examples/firefox-logo.svg"
      width="200" />
  </div>
</section>

.example-container {
  background-color: white;
  width: 260px;
  height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#example-element {
  flex: 1;
  padding: 30px;
}

var rect1 = { x: 5, y: 5, width: 50, height: 50 };
var rect2 = { x: 20, y: 10, width: 10, height: 10 };

if (
  rect1.x < rect2.x + rect2.width &&
  rect1.x + rect1.width > rect2.x &&
  rect1.y < rect2.y + rect2.height &&
  rect1.y + rect1.height > rect2.y
) {
  // collision detected!
}

// filling in the values =>

if (5 < 30 && 55 > 20 && 5 < 20 && 55 > 10) {
  // collision detected!
}

<div id="cr-stage"></div>
<p>
  Move the rectangle with arrow keys. Green means collision, blue means no
  collision.
</p>
<script
  type="text/javascript"
  src="https://cdnjs.cloudflare.com/ajax/libs/crafty/0.5.4/crafty-min.js"></script>

Crafty.init(200, 200);

var dim1 = { x: 5, y: 5, w: 50, h: 50 };
var dim2 = { x: 20, y: 10, w: 60, h: 40 };

var rect1 = Crafty.e("2D, Canvas, Color").attr(dim1).color("red");

var rect2 = Crafty.e("2D, Canvas, Color, Keyboard, Fourway")
  .fourway(2)
  .attr(dim2)
  .color("blue");

rect2.bind("EnterFrame", function () {
  if (
    rect1.x > rect2.x + rect2.w &&
    rect1.x + rect1.w > rect2.x &&
    rect1.y > rect2.y + rect2.h &&
    rect1.h + rect1.y > rect2.y
  ) {
    // collision detected!
    this.color("green");
  } else {
    // no collision
    this.color("blue");
  }
});