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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>

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Insecure Resource

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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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Packages

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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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

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HTML 

              
                <pre id="shape-code"></pre>
<div id="contenedor">
<div class="text">
  <div id="shape"></div>
  <p>Первые записи о многоугольниках и их свойствах находятся в древних текстах, включая папирус Риндса, датируемый приблизительно 1800 годом до н. э., который содержит доказательства некоторых теорем о треугольниках. В Месопотамии также существовали записи, касающиеся геометрических фигур. Древние греки сделали значительный вклад в изучение многоугольников. Эвклид, один из наиболее известных математиков античности, включил многоугольники и их свойства в свою работу "Начала" (или "Элементы"), которая оказала огромное влияние на развитие геометрии. В средние века и период Возрождения интерес к геометрии и многоугольникам возрос. Множество известных математиков, включая Леонардо Пизанского (Фибоначчи) и Альберта Дюрера, изучали свойства многоугольников и их взаимосвязь с другими геометрическими фигурами. В современных исследованиях геометрии и математики многоугольники играют важную роль. Они являются ключевым элементом в изучении топологии, теории графов, и геометрии. Понимание многоугольников и их свойств также имеет практическое применение в различных областях, включая компьютерную графику и инженерию.</p>
</div>
<svg width="500" height="500" viewBox="0 0 500 500">
</svg>
</div>
!

CSS 

              
                * {
  box-sizing:border-box;
}
#contenedor{width: 700px; margin:1em auto;}
svg {
  /*border: 1px solid #d9d9d9;*/
  display: block;
  position: absolute;
}

.text {
  font-size: 18px;
  font-family: sans-serif;
  padding: .5em;
  border: 1px solid #d9d9d9;
  position: absolute;
      width: 700px;
    user-select: none;
}

#shape {
  height: 500px;
  width: 500px;
  float: left;
  shape-margin:1em;
}

svg polygon {
  fill: #08d9d6;
  fill-rule: evenodd;
}

svg circle {
  fill: rgba(200, 255, 255, .5);
  stroke: #ccc;
  cursor:ew-resize;
}

pre{
  font-family: monospace;
  width: 700px;
  margin: 1.5em auto 0;
  padding: 0.5em;
  text-align: center;
  border: 1px solid #d9d9d9;
  background: #ffe8c1;
  font-size: 1em;
  user-select: none;
}
!

JS 

              
                var SVG_NS = 'http://www.w3.org/2000/svg';
var XLink_NS = 'http://www.w3.org/1999/xlink';
var svg = document.querySelector("svg");
var contenedor = document.querySelector("#contenedor");
var elId, circ;
m = { // mouse position
  x: 0,
  y: 0
};
var dragging = false;

var ry = [];
ry[0] = {
  x: 100,
  y: 50
};

ry[1] = {
  x: 175,
  y: 120
};

ry[2] = {
  x: 200,
  y: 200
};

ry[3] = {
  x: 260,
  y: 270
};

ry[4] = {
  x: 250,
  y: 380
};

ry[5] = {
  x: 100,
  y: 430
};

function getPoints(ry) {
  var points = "0,0 ";
  for (var i = 0; i < ry.length; i++) {
    points += ry[i].x + "," + ry[i].y + " ";
  }
  points += "0,500"
  return points;
}

function drawPolygon(ry, polygon) {
  var points = getPoints(ry);
  polygon.setAttributeNS(null, 'points', points);
}

var polygon = document.createElementNS(SVG_NS, 'polygon');
drawPolygon(ry, polygon);
svg.appendChild(polygon);

for (var i = 0; i < ry.length; i++) {
  var circ = document.createElementNS(SVG_NS, 'circle');
  circ.setAttributeNS(null, 'cx', ry[i].x);
  circ.setAttributeNS(null, 'cy', ry[i].y);
  circ.setAttributeNS(null, 'r', "15");
  circ.setAttributeNS(null, 'id', "circ" + i);
  svg.appendChild(circ);
}

var c = document.querySelectorAll("svg circle");

svg.addEventListener("mousedown", function(evt) {
  if (evt.target.id.search("circ") == 0) {
    dragging = true;
    elId = evt.target.id.replace("circ", "");
    circ = c[elId];
  }
}, false);

svg.addEventListener("mousemove", function(evt) {
  if (dragging) {
    m = oMousePos(svg, evt);

    circ.setAttributeNS(null, 'cx', m.x);
    circ.setAttributeNS(null, 'cy', m.y);

    ry[elId].x = m.x;
    ry[elId].y = m.y;

    drawPolygon(ry, polygon);
    shapeOutsidePolygon(ry);

  }
}, false);

svg.addEventListener("mouseup", function(evt) {
  dragging = false;
}, false);

/*svg.addEventListener("mouseout", function(evt) {
  dragging = false;
}, false);*/

function oMousePos(el, evt) {
  var ClientRect = el.getBoundingClientRect();
  return { //objeto
    x: Math.round(evt.clientX - ClientRect.left),
    y: Math.round(evt.clientY - ClientRect.top)
  }
}


function shapeOutsidePolygon(ry){
  var shape_outside = "polygon(";
  for(var i = 0; i < ry.length; i++){
    shape_outside += ry[i].x + "px "+ry[i].y+"px,";

  }
  shape_outside += "0 500px)";
  document.querySelector("#shape").style.webkitShapeOutside = shape_outside;
  document.querySelector("#shape").style.shapeOutside = shape_outside;
  document.querySelector("#shape-code").innerHTML = shape_outside;
}

shapeOutsidePolygon(ry)
!
999px

Console