src/stylesheet.css

body style {
  display: block;
  width: 100%;
  padding: 1em;
  margin: 1em 0 2em 0;
  border-radius: 3px;
  font-size: 12pt;
  font-family: monospace;
  word-break: break-word;
  white-space: pre-wrap;
  font-kerning: auto;
  color: rgba(0,0,0,.7);
  background: transparent;
  border: 1px solid rgba(0,0,0,.3);
}

* {
  box-sizing: border-box;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-kerning: auto;
}

body {
  margin: 1em;
  font-family: sans-serif;
}

[data-button] {
  display: block;
  margin: 1em 0;
}

div {
  display: inline-block;
  border-radius: .2em;
  padding: 1.5em;
  color: #555;
  font-size: 12pt;
  line-height: 1.4;
  background: #eee;
  border: 4px solid #ccc;
}

input,
textarea {
  display: block;
  min-width: 250px;
  border-radius: .2em;
  margin: 1em;
  padding: .5em;
  color: #555;
  font-size: 12pt;
  background: white;
  border: 4px solid #ccc;
}

section {
  height: 300px;
  display: inline-block;
  border: 4px dotted lightskyblue;
  padding: 1em;
}

img {
  max-width: 50px;
  box-shadow: rgba(0,0,0,.1) 0 .2em .5em;
}

img + img {
  margin-left: 1em;
}

p {
  font-size: 10pt;
  color: #555;
}

[class*=-scroll-x] {
  overflow-x: scroll;
}

[class*=-scroll-x] p {
  width: 200%;
}

[class*=-scroll-y] {
  height: 100px;
  overflow-y: scroll;
}

[data-drag] {
  overflow: auto;
}

[data-drag=horizontal] {
  resize: horizontal;
}

[data-drag=vertical] {
  resize: vertical;
}

[data-drag=both] {
  resize: both;
}

/* Min-width */
.minwidth[--element='{"minWidth": 300}'] {
  border-color: limegreen;
}

@supports (--element(".minwidth", {"minWidth": 300})) {
  [--self] {
    background: greenyellow;
  }
}

/* Max-width */
.maxwidth[--element='{"maxWidth": 300}'] {
  border-color: limegreen;
}

@supports (--element(".maxwidth", {"maxWidth": 300})) {
  [--self] {
    background: greenyellow;
  }
}

/* Min-height */
.minheight[--element='{"minHeight": 200}'] {
  border-color: limegreen;
}

@supports (--element(".minheight", {"minHeight": 200})) {
  [--self] {
    background: greenyellow;
  }
}

/* Max-height */
.maxheight[--element='{"maxHeight": 200}'] {
  border-color: limegreen;
}

@supports (--element(".maxheight", {"maxHeight": 200})) {
  [--self] {
    background: greenyellow;
  }
}

/* Min-characters on block elements */
.mincharacters[--element='{"minCharacters": 35}'] {
  border-color: limegreen;
}

@supports (--element(".mincharacters", {"minCharacters": 35})) {
  [--self] {
    background: greenyellow;
  }
}

/* Min-characters on input */
.mincharacters-input[--element='{"minCharacters": 35}'] {
  border-color: limegreen;
}

@supports (--element(".mincharacters-input", {"minCharacters": 35})) {
  [--self] {
    background: greenyellow;
  }
}

/* Min-characters on textarea */
.mincharacters-textarea[--element='{"minCharacters": 35}'] {
  border-color: limegreen;
}

@supports (--element(".mincharacters-textarea", {"minCharacters": 35})) {
  [--self] {
    background: greenyellow;
  }
}

/* Characters on block elements */
.characters[--element='{"characters": 5}'] {
  border-color: limegreen;
}

@supports (--element(".characters", {"characters": 5})) {
  [--self] {
    background: greenyellow;
  }
}

/* Characters on input */
.characters-input[--element='{"characters": 5}'] {
  border-color: limegreen;
}

@supports (--element(".characters-input", {"characters": 5})) {
  [--self] {
    background: greenyellow;
  }
}

/* Characters on textarea */
.characters-textarea[--element='{"characters": 5}'] {
  border-color: limegreen;
}

@supports (--element(".characters-textarea", {"characters": 5})) {
  [--self] {
    background: greenyellow;
  }
}

/* Max-characters */
.maxcharacters[--element='{"maxCharacters": 35}'] {
  border-color: limegreen;
}

@supports (--element(".maxcharacters", {"maxCharacters": 35})) {
  [--self] {
    background: greenyellow;
  }
}

/* Max-characters on input */
.maxcharacters-input[--element='{"maxCharacters": 35}'] {
  border-color: limegreen;
}

@supports (--element(".maxcharacters-input", {"maxCharacters": 35})) {
  [--self] {
    background: greenyellow;
  }
}

/* Max-characters on textarea */
.maxcharacters-textarea[--element='{"maxCharacters": 35}'] {
  border-color: limegreen;
}

@supports (--element(".maxcharacters-textarea", {"maxCharacters": 35})) {
  [--self] {
    background: greenyellow;
  }
}

/* Min-children */
.minchildren[--element='{"minChildren": 5}'] {
  border-color: limegreen;
}

@supports (--element(".minchildren", {"minChildren": 5})) {
  [--self] {
    background: greenyellow;
  }
}

/* Children */
.children[--element='{"totalChildren": 5}'] {
  border-color: limegreen;
}

@supports (--element(".children", {"totalChildren": 5})) {
  [--options] {
    --selector: window;
    --events: ["load", "resize", "input", "click", "mouseup"];
  }
  [--self] {
    background: greenyellow;
  }
}

/* Max-children */
.maxchildren[--element='{"maxChildren": 5}'] {
  border-color: limegreen;
}

@supports (--element(".maxchildren", {"maxChildren": 5})) {
  [--self] {
    background: greenyellow;
  }
}

/* Min-scroll-y */
.min-scroll-y[--element='{"minScrollY": 50}'] {
  --selector: window;
  --events: ["load"];
  border-color: limegreen;
}

.min-scroll-y[--element='{"minScrollY": 50}'] {
  --selector: ".min-scroll-y";
  --events: ["scroll"];
  border-color: limegreen;
}

@supports (--element(".min-scroll-y", {"minScrollY": 50})) {
  [--options]{
    --selector: window;
    --events: ["load"];
  }
  [--self] {
    background: greenyellow;
  }
}

@supports (--element(".min-scroll-y", {"minScrollY": 50})) {
  [--options] {
    --selector: ".min-scroll-y";
    --events: ["scroll"];
  }
  [--self] {
    background: greenyellow;
  }
}

/* Max-scroll-y */
.max-scroll-y[--element='{"maxScrollY": 50}'] {
  --selector: window;
  --events: ["load"];
  border-color: limegreen;
}

.max-scroll-y[--element='{"maxScrollY": 50}'] {
  --selector: ".max-scroll-y";
  --events: ["scroll"];
  border-color: limegreen;
}

@supports (--element(".max-scroll-y", {"maxScrollY": 50})) {
  [--options] {
    --selector: window;
    --events: ["load"];
  }
  [--self] {
    background: greenyellow;
  }
}

@supports (--element(".max-scroll-y", {"maxScrollY": 50})) {
  [--options] {
    --selector: ".max-scroll-y";
    --events: ["scroll"];
  }
  [--self] {
    background: greenyellow;
  }
}

/* Min-scroll-x */
.min-scroll-x[--element='{"minScrollX": 50}'] {
  --selector: window;
  --events: ["load"];
  border-color: limegreen;
}

.min-scroll-x[--element='{"minScrollX": 50}'] {
  --selector: ".min-scroll-x";
  --events: ["scroll"];
  border-color: limegreen;
}

@supports (--element(".min-scroll-x", {"minScrollX": 50})) {
  [--options] {
    --selector: window;
    --events: ["load"];
  }
  [--self] {
    background: greenyellow;
  }
}

@supports (--element(".min-scroll-x", {"minScrollX": 50})) {
  [--options] {
    --selector: ".min-scroll-x";
    --events: ["scroll"];
  }
  [--self] {
    background: greenyellow;
  }
}

/* Max-scroll-x */
.max-scroll-x[--element='{"maxScrollX": 50}'] {
  --selector: window;
  --events: ["load"];
  border-color: limegreen;
}

.max-scroll-x[--element='{"maxScrollX": 50}'] {
  --selector: ".max-scroll-x";
  --events: ["scroll"];
  border-color: limegreen;
}

@supports (--element(".max-scroll-x", {"maxScrollX": 50})) {
  [--options] {
    --selector: window;
    --events: ["load"];
  }
  [--self] {
    background: greenyellow;
  }
}

@supports (--element(".max-scroll-x", {"maxScrollX": 50})) {
  [--options] {
    --selector: ".max-scroll-x";
    --events: ["scroll"];
  }
  [--self] {
    background: greenyellow;
  }
}

/* Square Orientation */
.orientation[--element='{"orientation": "square"}'] {
  border-color: darkorchid;
}

@supports (--element(".orientation", {"orientation": "square"})) {
  [--self] {
    background: orchid;
  }
}

/* Portrait Orientation */
.orientation[--element='{"orientation": "portrait"}'] {
  border-color: teal;
}

@supports (--element(".orientation", {"orientation": "portrait"})) {
  [--self] {
    background: darkturquoise;
  }
}

/* Landscape Orientation */
.orientation[--element='{"orientation": "landscape"}'] {
  border-color: limegreen;
}

@supports (--element(".orientation", {"orientation": "landscape"})) {
  [--self] {
    background: greenyellow;
  }
}

/* Min-aspect ratio */
.minaspectratio[--element='{"minAspectRatio": 1.777}'] {
  border-color: limegreen;
}

@supports (--element(".minaspectratio", {"minAspectRatio": 1.777})) {
  [--self] {
    background: greenyellow;
  }
}

/* Max-aspect-ratio */
.maxaspectratio[--element='{"maxAspectRatio": 1.777}'] {
  border-color: limegreen;
}

@supports (--element(".maxaspectratio", {"maxAspectRatio": 1.777})) {
  [--self] {
    background: greenyellow;
  }
}