components/layout/stylesheets/servo.css

button {
    cursor: default;
}

button,
input {
  background: white;
  border: solid lightgrey 1px;
  color: black;
  font-family: sans-serif;
  font-size: 0.8333em;
}

textarea {
  background: white;
  border: solid lightgrey 1px;
  color: black;
  font-family: sans-serif;
  font-size: 0.8333em;
}

input::-servo-text-control-inner-editor {
  overflow-wrap: normal;
  pointer-events: auto;
}

/* FIXME(#36982): Use `display: block; align-content: center` instead of flex. */
input::-servo-text-control-inner-container {
  display: flex;
  height: stretch;
  pointer-events: none;
  position: relative;
}

input:not(:placeholder-shown)::placeholder {
  visibility: hidden !important;
}

input::-servo-text-control-inner-editor, input::placeholder {
  block-size: fit-content !important;
  min-width: stretch;
  white-space: pre;
}

input::placeholder {
  color: grey;
  inset-block: 0 !important;
  margin-block: auto !important;
  overflow: hidden;
  pointer-events: none !important;
  position: absolute !important;
}

input::color-swatch {
  box-sizing: border-box;
  border: 1px solid gray;
  border-radius: 2px;
  display: inline-block;
  height: 100%;
  width: 100%;
}

input::selection,
textarea::selection {
  background: rgba(176, 214, 255, 1.0);
  color: black;
}

button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  background: lightgrey;
  border-top: solid 1px #EEEEEE;
  border-left: solid 1px #CCCCCC;
  border-right: solid 1px #999999;
  border-bottom: solid 1px #999999;
  color: black;
}

input[type="hidden"] { display: none !important }

input[type="checkbox"],
input[type="radio"] {
  font-family: monospace !important;
  border: none !important;
  background: transparent;
}

input[type="checkbox"]::before {
  display: inline-block;
  border: solid currentcolor 1px;
  content: "";
  padding: 0;
  width: 1em;
  height: 1em;
  text-align: center;
}

input[type="checkbox"]:checked::before { content: "✓"; }
input[type="checkbox"]:indeterminate::before { content: "-"; }

input[type="radio"]::before {
  display: inline-block;
  border: solid currentcolor 1px;
  content: "";
  padding: 0;
  width: 1em;
  height: 1em;
  border-radius: 50%;
  text-align: center;
}

input[type="radio"]:checked::before { content: "●"; line-height: 1em; }

input[type="file"]::before {
  content: "Choose File";
  background: lightgrey;
  border-top: solid 1px #EEEEEE;
  border-left: solid 1px #CCCCCC;
  border-right: solid 1px #999999;
  border-bottom: solid 1px #999999;
}

input[type="file"] {
  text-align: center;
  color: black;
  border-style: none;
}

input[type="color"] {
  padding: 6px;
  width: 64px;
  height: 32px;
  border-radius: 2px;
  background: lightgrey;
  border: 1px solid gray;
}

td[align="left"]    { text-align: left; }
td[align="center"]  { text-align: center; }
td[align="right"]   { text-align: right; }

center { text-align: -moz-center; }

label { cursor: default; }

img {
  overflow: clip !important;
  overflow-clip-margin: 0 !important;
}

input:not([type=radio i]):not([type=checkbox i]):not([type=reset i]):not([type=button i]):not([type=submit i]) {
  cursor: text;
  overflow: hidden !important;
  white-space: pre;
}

textarea {
  cursor: text;
  overflow: auto;
}

/* https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements */
details {
  display: block;
}

details::-servo-details-summary {
  margin-left: 40px;
  display: list-item;
  list-style: disclosure-closed;
}

details[open]::-servo-details-summary {
  list-style: disclosure-open;
}

*|*::-servo-details-content {
  margin-left: 40px;
  overflow: hidden;
  display: block;
}

/*
 * Until servo supports svg properly, make sure to at least prevent svg
 * children from being layed out and rendered like usual html.
 * https://github.com/servo/servo/issues/10646
 */
svg > * {
  display: none;
}

*|*::-servo-anonymous-box {
  unicode-bidi: inherit;
  direction: inherit;
  writing-mode: inherit;
}

*|*::-servo-anonymous-table {
    display: table;
}

*|*::-servo-anonymous-table-row {
    display: table-row;
}

*|*::-servo-anonymous-table-cell {
    display: table-cell;
}

*|*::-servo-table-grid {
  all: inherit;
  margin: unset;
  float: unset;
  clear: unset;
  position: unset;
  z-index: unset;
  page-break-before: unset;
  page-break-after: unset;
  page-break-inside: unset;
  vertical-align: unset;
  line-height: unset;
  transform: unset;
  transform-origin: unset;
  backface-visibility: unset;
  clip: unset;
  transform-style: unset;
  rotate: unset;
  scale: unset;
  translate: unset;
  align-self: unset;
  justify-self: unset;
  grid-column-start: unset;
  grid-column-end: unset;
  grid-row-start: unset;
  grid-row-end: unset;
  order: unset;
  outline: unset;
  outline-offset: unset;
  column-span: unset;
  contain: unset;
  container: unset;
  scroll-margin: unset;

  /* The grid needs to be block-level, so avoid inheriting `display: inline-table`. */
  display: table;
}

meter {
  display: inline-block;
  width: 100px;
  height: 12px;
  border-radius: 6px;
  background: linear-gradient(#e6e6e6, #e6e6e6, #eeeeee 20%, #cccccc 45%, #cccccc 55%);
  overflow: clip;
}

/* FIXME: These should use the ::-moz-meter-bar pseudo element */
meter div {
  height: 100%;
}

meter:-moz-meter-optimum div {
  background: linear-gradient(#ad7, #ad7, #cea 20%, #7a3 45%, #7a3 55%);
}
meter:-moz-meter-sub-optimum div {
  background: linear-gradient(#fe7, #fe7, #ffc 20%, #db3 45%, #db3 55%);
}
meter:-moz-meter-sub-sub-optimum div {
  background: linear-gradient(#f77, #f77, #fcc 20%, #d44 45%, #d44 55%);
}

/* https://html.spec.whatwg.org/#the-details-and-summary-elements */
details, summary {
  display: block;
}
details > summary:first-of-type {
  display: list-item;
  counter-increment: list-item 0;
  list-style: disclosure-closed inside;
}
details[open] > summary:first-of-type {
  list-style-type: disclosure-open;
}

/* Styles for the <progress> element */
progress {
  display: inline-block;
  width: 200px;
  height: 6px;
  border-radius: 3px;
  border: 1px solid rgba(0, 0, 0, 0.5);
}
/* FIXME: This should use ::-moz-progress-bar */
progress #-servo-progress-bar {
  display: block;
  height: 100%;
  background-color: #7a3;
}

/* Mostly matches https://searchfox.org/mozilla-central/rev/a1f4cb9fc03d81be41ca2ba81294592df784364d/layout/style/res/forms.css#217-243 */
select {
  background-color: lightgrey;
  border-radius: 5px;
  border: 1px solid gray;
  padding: 0 0.25em;
  cursor: default; /* Don't change cursor when hovering */
  margin: 0;
  white-space: nowrap !important;
  word-wrap: normal !important;
  box-sizing: border-box;
  user-select: none;
  overflow: clip;
  /* No text-decoration reaching inside, by default */
  display: inline-block;
  page-break-inside: avoid;
  overflow-clip-box: padding-box !important;
  padding-block: 1px;
  font-family: sans-serif;

  /* These styles are specific to single-select elements */
  padding-inline: 4px;
  color: black;
  vertical-align: baseline;
  appearance: auto;
}

/* Matches https://searchfox.org/mozilla-central/rev/a1f4cb9fc03d81be41ca2ba81294592df784364d/layout/style/res/forms.css#120-132 */
input,
textarea,
select,
button {
  text-align: initial;
  text-indent: initial;
  text-shadow: initial;
  text-transform: initial;
  word-spacing: initial;
  letter-spacing: initial;
  /* Note that line-height is also reset for all these, via the font shorthand */
}

input[type="reset" i],
input[type="button" i],
input[type="submit" i],
button {
  text-align: center;
}

slot {
  display: contents;
}