Template:Sticky table start/sandbox/styles.css

/**
 * Make row N or thead element top sticky. Make column N left sticky.
 *
 * Div class:
 * - sticky-table-scroll: contain table w/ auto scroll; height 75vh screen.
 *
 * Table classes:
 * - sticky-table-head: top sticky thead; headers moved via sortable + JS.
 * - sticky-table-row1: top sticky first row.
 * - sticky-table-row2: top sticky second row.
 * - sticky-table-row1: left sticky first column.
 * - sticky-table-row2: left sticky second column.
 *
 * Cell classes:
 * - sticky-table-unsticky: remove sticky to fix span issues.
 *
 * Notes:
 * - Sortable moves to thead any header rows and (after sort) sorttop rows.
 * - Sticky gadget (.mw-sticky-header) moves to thead any wikitable header rows.
 */
@media screen {
  /**
   * Div container with restricted height/width + scroll.
   */
  .sticky-table-scroll {
    margin-bottom: 1em; /* Moved from table. */
    margin-top: 1em; /* Moved from table. */
    max-height: 75vh;
    max-width: max-content; /* Vertical scroll next to div. */
    /* min-width: 300px; /* In case another element floats right. */
    overflow-y: auto;
  }
  .sticky-table-scroll table {
    margin-bottom: 0; /* Move to div. */
    margin-top: 0; /* Move to div. */
  }
  .sticky-table-scroll table > caption {
    text-align: left; /* Fix short centered caption hidden on wide table. */
  }

  /**
   * Make top sticky.
   */
  .sticky-table-scroll .sticky-table-row1 > thead > tr:nth-child(1),
  .sticky-table-scroll .sticky-table-row1 > caption + tbody > tr:nth-child(1),
  .sticky-table-scroll .sticky-table-row1 > tbody:first-child > tr:nth-child(1),
  .sticky-table-scroll .sticky-table-row2 > thead > tr:nth-child(2),
  .sticky-table-scroll .sticky-table-row2 > caption + tbody > tr:nth-child(2),
  .sticky-table-scroll .sticky-table-row2 > tbody:first-child > tr:nth-child(2),
  .sticky-table-scroll .sticky-table-head > thead {
    position: sticky; /* Was "static". */
    top: 0;
    z-index: 10;
  }

  /**
   * Make left sticky.
   */
  .sticky-table-scroll .sticky-table-col1 > * > tr > :nth-child(1):not(.sticky-table-unsticky),
  .sticky-table-scroll .sticky-table-col2 > * > tr > :nth-child(2):not(.sticky-table-unsticky) {
    position: sticky; /* Was "static". */
    left: 0;
    z-index: 9;
  }

  /**
   * Fix scrolling data shows through sticky's transparent background.
   */
  .sticky-table-scroll table:not(.wikitable) {
    background-color: white;
  }
  .sticky-table-scroll table > thead,
  .sticky-table-scroll table > tbody,
  .sticky-table-scroll table > tfoot,
  .sticky-table-scroll table > * > tr,
  .sticky-table-scroll table > * > tr > td,
  .sticky-table-scroll :not(.wikitable) > * > tr > th {
    background-color: inherit;
  }

  /**
   * Fix missing borders due to sticky position and wikitable collapsed borders.
   * https://bugs.webkit.org/show_bug.cgi?id=128486
   *
   * Skip rare plain table separated borders, which sometimes shows scrolling
   * data through sticky's 2px "border-spacing".
   *
   * Skip very rare Timeless plain table ".mw-datatable" collapsed boarders.
   */
  .sticky-table-scroll .wikitable {
    border-collapse: separate; /* Was "collapse". */
    border-spacing: 0;
    border-width: 1px 0 0 1px;
  }
  .sticky-table-scroll .wikitable > * > tr > td,
  .sticky-table-scroll .wikitable > * > tr > th {
    border-width: 0 1px 1px 0;
  }
  /* Adjust {{static row numbers}} borders. */
  .sticky-table-scroll .static-row-numbers.wikitable > * > tr::before {
    border-right-width: 1px;
  }
  /* .sticky-table-scroll .static-row-numbers.wikitable > * > .sorttop:not(:has(~ .sorttop))::before, */
  .sticky-table-scroll .static-row-numbers.wikitable > tbody > tr:last-child::before,
  .sticky-table-scroll .static-row-numbers.wikitable > tfoot > tr:last-child::before {
    border-bottom-width: 1px;
  }
  .sticky-table-scroll .static-row-numbers.wikitable > tbody > tr:not(.static-row-header)::before {
    border-top-width: 0 !important;
    border-left-width: 0 !important;
  }

  /**
   * Modify collapsible's show/hide.
   * - Show: expand table w/o scroll or sticky.
   * - Hide: collapse table w/ scroll and sticky content. Accessible.
   */
  /* Button. */
  .sticky-table-collapsible .mw-collapsible-toggle {
    float: none; /* Was "right". */
    padding-left: 0; /* Was "0.2em". */
    padding-right: 0; /* Was "0.2em". */
  }
  /* Collapsed displays "show" button. */
  .sticky-table-collapsible.mw-collapsed .mw-collapsible-content {
  	display: block !important; /* Was "none". */
  }
  /* Expanded displays "hide" button. */
  .sticky-table-collapsible:not(.mw-collapsed) .sticky-table-scroll {
    max-height: none !important; /* Default. */
    overflow-y: visible; /* Default. */
  }
  .sticky-table-collapsible:not(.mw-collapsed) .sticky-table-row1 > thead > tr:nth-child(1),
  .sticky-table-collapsible:not(.mw-collapsed) .sticky-table-row1 > caption + tbody > tr:nth-child(1),
  .sticky-table-collapsible:not(.mw-collapsed) .sticky-table-row1 > tbody:first-child > tr:nth-child(1),
  .sticky-table-collapsible:not(.mw-collapsed) .sticky-table-row2 > thead > tr:nth-child(2),
  .sticky-table-collapsible:not(.mw-collapsed) .sticky-table-row2 > caption + tbody > tr:nth-child(2),
  .sticky-table-collapsible:not(.mw-collapsed) .sticky-table-row2 > tbody:first-child > tr:nth-child(2),
  .sticky-table-collapsible:not(.mw-collapsed) .sticky-table-head > thead,
  .sticky-table-collapsible:not(.mw-collapsed) .sticky-table-col1 > * > tr > :nth-child(1):not(.sticky-table-unsticky),
  .sticky-table-collapsible:not(.mw-collapsed) .sticky-table-col2 > * > tr > :nth-child(2):not(.sticky-table-unsticky) {
    position: static; /* Default. */
  }

  /**
   * Fix Timeless. Wasn't sticky when on very wide tables.
   */
  body.skin-timeless .sticky-table-scroll .overflowed,
  body.skin-timeless .sticky-table-scroll .overflowed .content-table {
    overflow: visible; /* Reset. */
  }
  body.skin-timeless .sticky-table-scroll .overflowed {
    margin-top: 0; /* Was "1em". */
    margin-bottom: 0; /* Was "1em". */
  }
  body.skin-timeless .sticky-table-scroll .scroll-right.overflowed .content-table-right {
    box-shadow: none; /* Reset. */
    border-left: none; /* Reset. */
  }
  body.skin-timeless .sticky-table-scroll .wikitable {
    padding: 0;
  }

  /**
   * Reset Sticky Table Headers gadget styles causing sticky issues if enabled.
   */
  .sticky-table-scroll .jquery-tablesorter > thead,
  .sticky-table-scroll .mw-sticky-header > thead {
    top: 0 !important; /* Was value based on skin and max/min width. */
  }
  .sticky-table-scroll .jquery-tablesorter > tfoot,
  .sticky-table-scroll .mw-sticky-header > tfoot {
    position: static; /* Was "sticky". */
    bottom: auto; /* Was "0". */
  }
}

/**
 * Fix skins width <=639px (mobile) not sticky. Override to make sticky.
 */
@media screen and (max-width: 639px) {
  body.skin-minerva .sticky-table-scroll table,
  body.skin-monobook .sticky-table-scroll table,
  body.skin-vector-legacy .sticky-table-scroll table,
  body.skin-vector-2022 .sticky-table-scroll table
  {
    display: table; /* Was "block". */
  }
  body.skin-minerva .sticky-table-scroll table > caption {
    display: table-caption; /* Was "block". */
  }
}

@media print {
  /* In case set in template parameter. */
  .sticky-table-scroll {
    max-height: none !important; /* Default. */
    max-width: none !important; /* Default. */
  }
  /* Collapsible button. */
  .sticky-table-collapsible .mw-collapsible-toggle {
    display: none;
  }
}