Total CSS reset. Puts all properties back to their defaults from https://developer.mozilla.org/en-US/docs/Web/CSS. Good for bookmarklets and extensions, or if you just don't want to deal with any nonsense.

total_css_reset.css

* {
  align-content:  stretch;
  align-items:  stretch;
  align-self:  auto;
  animation-delay:  0s;
  animation-direction:  normal;
  animation-duration:  0s;
  animation-fill-mode:  none;
  animation-iteration-count:  1;
  animation-name:  none;
  animation-play-state:  running;
  animation-timing-function:  ease;
  backface-visibility:  visible;
  background-attachment:  scroll;
  background-clip:  border-box;
  background-color:  transparent;
  background-image:  none;
  background-origin:  padding-box;
  background-position:  0% 0%;
  background-repeat:  repeat;
  background-size:  auto auto;
  border: none;
  border-bottom-color:  currentColor;
  border-bottom-left-radius:  0;
  border-bottom-right-radius:  0;
  border-bottom-style:  none;
  border-bottom-width:  medium;
  border-collapse:  separate;
  border-image-outset:  0s;
  border-image-repeat:  stretch;
  border-image-slice:  100%;
  border-image-source:  none;
  border-image-width:  1;
  border-left-color:  currentColor;
  border-left-style:  none;
  border-left-width:  medium;
  border-right-color:  currentColor;
  border-right-style:  none;
  border-right-width:  medium;
  border-spacing:  0;
  border-top-color:  currentColor;
  border-top-left-radius:  0;
  border-top-right-radius:  0;
  border-top-style:  none;
  border-top-width:  medium;
  bottom:  auto;
  box-shadow:  none;
  box-sizing:  content-box;
  break-after:  auto;
  break-before:  auto;
  caption-side:  top;
  clear:  none;
  clip:  auto;
  color:  black;
  column-count:  auto;
  column-fill:  balance;
  column-gap:  normal;
  column-rule-color:  currentColor;
  column-rule-style:  none;
  column-rule-width:  medium;
  column-span:  none;
  column-width:  auto;
  content:  normal;
  counter-increment:  none;
  counter-reset:  none;
  cursor:  auto;
  direction:  ltr;
  display:  inline;
  empty-cells:  show;
  filter:  none;
  flex-basis:  auto;
  flex-direction:  row;
  flex-grow:  0;
  flex-shrink:  1;
  flex-wrap:  nowrap;
  float:  none;
  font-family:  sans-serif;
  font-feature-settings:  normal;
  font-size:  medium;
  font-size-adjust:  none;
  font-stretch:  normal;
  font-style:  normal;
  font-variant:  normal;
  font-weight:  normal;
  height:  auto;
  hyphens:  manual;
  image-orientation:  0deg;
  image-rendering:  auto;
  ime-mode:  auto;
  justify-content:  flex-start;
  left:  auto;
  letter-spacing:  normal;
  line-height:  normal;
  list-style-image:  none;
  list-style-position:  outside;
  list-style-type:  disc;
  margin-bottom:  0;
  margin-left:  0;
  margin-right:  0;
  margin-top:  0;
  marks:  none;
  mask-type:  luminance;
  max-height:  none;
  max-width:  none;
  min-height:  0;
  min-width:  0;
  opacity:  1.0;
  order:  0;
  orphans:  2;
  outline-color:  currentColor;
  outline-offset:  0;
  outline-style:  none;
  outline-width:  medium;
  overflow:  visible;
  overflow-x:  visible;
  overflow-y:  visible;
  padding-bottom:  0;
  padding-left:  0;
  padding-right:  0;
  padding-top:  0;
  page-break-after:  auto;
  page-break-before:  auto;
  page-break-inside:  auto;
  perspective:  none;
  perspective-origin:  50% 50%;
  pointer-events:  auto;
  position:  static;
  quotes:  none;
  resize:  none;
  right:  auto;
  tab-size:  8;
  table-layout:  auto;
  text-align:  left;
  text-align-last:  auto;
  text-decoration-color:  currentColor;
  text-decoration-line:  none;
  text-decoration-style:  solid;
  text-indent:  0;
  text-overflow:  clip;
  text-rendering:  auto;
  text-shadow:  none;
  text-transform:  none;
  text-underline-position:  auto;
  top:  auto;
  transform:  none;
  transform-origin:  50% 50% 0;
  transform-style:  flat;
  transition-delay:  0s;
  transition-duration:  0s;
  transition-property:  all;
  transition-timing-function:  ease;
  unicode-bidi:  normal;
  vertical-align:  baseline;
  visibility:  visible;
  white-space:  normal;
  widows:  2;
  width:  auto;
  word-break:  normal;
  word-spacing:  normal;
  word-wrap:  normal;
  z-index:  auto;
}