CSS - Properties - border-collapse

  table {
      border-collapse: separate; /* This is the default */
  }
  

  table {
      border-collapse: collapse;
  }
  

CSS syntax:
border-collapse: separate | collapse | inherit; ref.

Remind me, what is a CSS property?

  /* This is a CSS rule */
  byElementName, .byClass, #byId /* These are CSS selectors. */
  {
     /* This is a CSS declaration block */
     property: value; /* This is a CSS declaration */
     property: value; /* A CSS declaration assigns a value to a property */
  }