ins {
  padding: 0 0.125em;
  text-decoration: none;
  background-color: lightgreen
}
del {
  padding: 0 0.125em;
  text-decoration: none;
  background-color: pink;
}
mark {
  padding: 0 0.125em;
}
.note {
  padding: 0 0.125em;
  background-color: lightblue;
}
aside.note {
  padding: 0.5em 1em;
}
u {
  text-decoration: none;
  border-bottom: 3px red dashed;
}