CSS Highlighting table row and column is not effective - css

Question

I have 4 tables side by side like the one in Highlight column and row in a table ::after and ::before not work
My problem is that, take the table in that question for example, when the mouse goes from c to b or a (or from b to a) the highlight stays at the row with c instead of moving to b or a (stays at the row with b). Basically, it works fine when the mouse goes from upside to downside, but not from downside to the upside.
I am wondering how to fix it. Because I also make the table cell highlighted when it is clicked, and record which cell is highlighted and unhighlighted, so the problem somtimes makes a wrong cell highlighted when clicked, and makes the record somehow biased.
I am testing using Chrome.
Here is an example
th{
font-weight: normal;
align-content: center;
}
td {
border: black solid;
border-width: 1px 2px 1px 1px;
padding: 5px;
text-align: center;
height:1.1cm;
width:1.1cm;
background-clip: padding-box
}
.col {
width: 1.1cm;
}
.rotate {
text-align: center;
white-space: nowrap;
vertical-align: middle;
width: 1.5em;
}
.rotate div {
-moz-transform: rotate(-90.0deg); /* FF3.5+ */
-o-transform: rotate(-90.0deg); /* Opera 10.5 */
-webkit-transform: rotate(-90.0deg); /* Saf3.1+, Chrome */
filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=0.083); /* IE6,IE7 */
-ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=0.083)"; /* IE8 */
margin-left: -1cm;
margin-right: -1cm;
}
.float-left {
width: 25%;
float: left;
}
tr.hl:hover th:not([rowspan]),
tr.hl:hover td {
background-color: rgba(255,255,0,0.25);
}
td:hover::before {
content: '';
position: absolute;
background-color: rgba(255,255,0,0.25);
z-index: 0;
width: 100%;
top: 0;
}
td:hover::after,
.col:hover::after {
content: '';
position: absolute;
background-color: rgba(255,255,0,0.25);
z-index: 0;
height: 2000%;
width: 100%;
bottom: -1000%;
left: 0;
}
th,
td {
position: relative;
}
table{
overflow: hidden;
}
thead th{
background-color:white;
box-shadow: 0 0 0 2px white;
z-index: 1;
}
<div class="g1g2">
<div class="float-left">
<table id="player1" style="margin-bottom: 1cm">
<thead>
<tr>
<th colspan=5 style="text-align: right" >Player 1's Payoffs </th>
</tr>
<tr>
<th colspan=2 rowspan=2></th>
<th colspan=3 style="font-size: smaller; text-align: center">Player 2's actions</th>
</tr>
</thead>
<tr style="text-align: center">
<th colspan="2"></th>
<th class="col">d</th>
<th class="col">e</th>
<th class="col">f</th>
</tr>
<tr class="hl">
<th rowspan=3 class="rotate" style="font-size: smaller;"> <div>Player 1's actions</div></th>
<th>a</th>
<td>8</td>
<td>20</td>
<td>12</td>
</tr>
<tr class="hl">
<th>b</th>
<td>0</td>
<td>8</td>
<td>16</td>
</tr>
<tr class="hl">
<th>c</th>
<td>18</td>
<td>12</td>
<td>6</td>
</tr>
</table>
</div>
</div>
<div class="g1g2">
<div class="float-left">
<table id="player2" style="margin-bottom: 1cm">
<thead>
<tr>
<th colspan=5 style="text-align: right">Player 2's Payoffs </th>
</tr>
<tr>
<th colspan=2 rowspan=2></th>
<th colspan=3 style="font-size: smaller; text-align: center">Player 3's actions</th>
</tr>
</thead>
<tr style="text-align: center">
<th colspan="2"></th>
<th class="col">g</th>
<th class="col">h</th>
<th class="col">i</th>
</tr>
<tr class="hl">
<th rowspan=3 class="rotate" style="font-size: smaller"> <div>Player 2's actions</div></th>
<th>d</th>
<td>14</td>
<td>18</td>
<td>4</td>
</tr>
<tr class="hl">
<th>e</th>
<td>20</td>
<td>14</td>
<td>8</td>
</tr>
<tr class="hl">
<th>f</th>
<td>16</td>
<td>2</td>
<td>18</td>
</tr>
</table>
</div>
</div>
<div class="g1g2">
<div class="float-left">
<table id="player3" style="margin-bottom: 1cm">
<thead>
<tr>
<th colspan=5 style="text-align: right">Player 3's Payoffs </th>
</tr>
<tr>
<th colspan=2 rowspan=2></th>
<th colspan=3 style="font-size: smaller; text-align: center">Player 4's actions</th>
</tr>
</thead>
<tr style="text-align: center">
<th colspan="2"></th>
<th class="col">j</th>
<th class="col">k</th>
<th class="col">l</th>
</tr>
<tr class="hl">
<th rowspan=3 class="rotate" style="font-size: smaller"> <div>Player 3's actions</div></th>
<th>g</th>
<td>20</td>
<td>14</td>
<td>8</td>
</tr>
<tr class="hl">
<th>h</th>
<td>16</td>
<td>2</td>
<td>18</td>
</tr>
<tr class="hl">
<th>i</th>
<td>0</td>
<td>16</td>
<td>16</td>
</tr>
</table>
</div>
</div>
<div class="g1">
<div class="float-left">
<table id="player4a" style="margin-bottom: 1cm">
<thead>
<tr>
<th colspan=5 style="text-align: right">Player 4's Payoffs </th>
</tr>
<tr>
<th colspan=2 rowspan=2></th>
<th colspan=3 style="font-size: smaller; text-align: center">Player 1's actions</th>
</tr>
</thead>
<tr style="text-align: center">
<th colspan="2"></th>
<th class="col">a</th>
<th class="col">b</th>
<th class="col">c</th>
</tr>
<tr class="hl">
<th rowspan=3 class="rotate" style="font-size: smaller"> <div>Player 4's actions</div></th>
<th>j</th>
<td>12</td>
<td>16</td>
<td>14</td>
</tr>
<tr class="hl">
<th>k</th>
<td>8</td>
<td>12</td>
<td>10</td>
</tr>
<tr class="hl">
<th>l</th>
<td>6</td>
<td>10</td>
<td>8</td>
</tr>
</table>
</div>
</div>

Answer 1

Simplest fix would be to add pointer-events: none to ::after and ::before pseudo elements. It also has a great browser support.
Tbh I haven't looked at the code xD, but probably another fix would to be to mess around with z-index which I won't recommend since it can be solved with pointer-events.
th{
font-weight: normal;
align-content: center;
}
td {
border: black solid;
border-width: 1px 2px 1px 1px;
padding: 5px;
text-align: center;
height:1.1cm;
width:1.1cm;
background-clip: padding-box
}
.col {
width: 1.1cm;
}
.rotate {
text-align: center;
white-space: nowrap;
vertical-align: middle;
width: 1.5em;
}
.rotate div {
-moz-transform: rotate(-90.0deg); /* FF3.5+ */
-o-transform: rotate(-90.0deg); /* Opera 10.5 */
-webkit-transform: rotate(-90.0deg); /* Saf3.1+, Chrome */
filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=0.083); /* IE6,IE7 */
-ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=0.083)"; /* IE8 */
margin-left: -1cm;
margin-right: -1cm;
}
.float-left {
width: 25%;
float: left;
}
tr.hl:hover th:not([rowspan]),
tr.hl:hover td {
background-color: rgba(255,255,0,0.25);
}
td:hover::before {
content: '';
position: absolute;
background-color: rgba(255,255,0,0.25);
z-index: 0;
width: 100%;
top: 0;
}
td:hover::after,
.col:hover::after {
content: '';
position: absolute;
background-color: rgba(255,255,0,0.25);
z-index: 0;
height: 2000%;
width: 100%;
bottom: -1000%;
left: 0;
pointer-events: none;
}
th,
td {
position: relative;
}
table{
overflow: hidden;
}
thead th{
background-color:white;
box-shadow: 0 0 0 2px white;
z-index: 1;
}
<div class="g1g2">
<div class="float-left">
<table id="player1" style="margin-bottom: 1cm">
<thead>
<tr>
<th colspan=5 style="text-align: right" >Player 1's Payoffs </th>
</tr>
<tr>
<th colspan=2 rowspan=2></th>
<th colspan=3 style="font-size: smaller; text-align: center">Player 2's actions</th>
</tr>
</thead>
<tr style="text-align: center">
<th colspan="2"></th>
<th class="col">d</th>
<th class="col">e</th>
<th class="col">f</th>
</tr>
<tr class="hl">
<th rowspan=3 class="rotate" style="font-size: smaller;"> <div>Player 1's actions</div></th>
<th>a</th>
<td>8</td>
<td>20</td>
<td>12</td>
</tr>
<tr class="hl">
<th>b</th>
<td>0</td>
<td>8</td>
<td>16</td>
</tr>
<tr class="hl">
<th>c</th>
<td>18</td>
<td>12</td>
<td>6</td>
</tr>
</table>
</div>
</div>
<div class="g1g2">
<div class="float-left">
<table id="player2" style="margin-bottom: 1cm">
<thead>
<tr>
<th colspan=5 style="text-align: right">Player 2's Payoffs </th>
</tr>
<tr>
<th colspan=2 rowspan=2></th>
<th colspan=3 style="font-size: smaller; text-align: center">Player 3's actions</th>
</tr>
</thead>
<tr style="text-align: center">
<th colspan="2"></th>
<th class="col">g</th>
<th class="col">h</th>
<th class="col">i</th>
</tr>
<tr class="hl">
<th rowspan=3 class="rotate" style="font-size: smaller"> <div>Player 2's actions</div></th>
<th>d</th>
<td>14</td>
<td>18</td>
<td>4</td>
</tr>
<tr class="hl">
<th>e</th>
<td>20</td>
<td>14</td>
<td>8</td>
</tr>
<tr class="hl">
<th>f</th>
<td>16</td>
<td>2</td>
<td>18</td>
</tr>
</table>
</div>
</div>
<div class="g1g2">
<div class="float-left">
<table id="player3" style="margin-bottom: 1cm">
<thead>
<tr>
<th colspan=5 style="text-align: right">Player 3's Payoffs </th>
</tr>
<tr>
<th colspan=2 rowspan=2></th>
<th colspan=3 style="font-size: smaller; text-align: center">Player 4's actions</th>
</tr>
</thead>
<tr style="text-align: center">
<th colspan="2"></th>
<th class="col">j</th>
<th class="col">k</th>
<th class="col">l</th>
</tr>
<tr class="hl">
<th rowspan=3 class="rotate" style="font-size: smaller"> <div>Player 3's actions</div></th>
<th>g</th>
<td>20</td>
<td>14</td>
<td>8</td>
</tr>
<tr class="hl">
<th>h</th>
<td>16</td>
<td>2</td>
<td>18</td>
</tr>
<tr class="hl">
<th>i</th>
<td>0</td>
<td>16</td>
<td>16</td>
</tr>
</table>
</div>
</div>
<div class="g1">
<div class="float-left">
<table id="player4a" style="margin-bottom: 1cm">
<thead>
<tr>
<th colspan=5 style="text-align: right">Player 4's Payoffs </th>
</tr>
<tr>
<th colspan=2 rowspan=2></th>
<th colspan=3 style="font-size: smaller; text-align: center">Player 1's actions</th>
</tr>
</thead>
<tr style="text-align: center">
<th colspan="2"></th>
<th class="col">a</th>
<th class="col">b</th>
<th class="col">c</th>
</tr>
<tr class="hl">
<th rowspan=3 class="rotate" style="font-size: smaller"> <div>Player 4's actions</div></th>
<th>j</th>
<td>12</td>
<td>16</td>
<td>14</td>
</tr>
<tr class="hl">
<th>k</th>
<td>8</td>
<td>12</td>
<td>10</td>
</tr>
<tr class="hl">
<th>l</th>
<td>6</td>
<td>10</td>
<td>8</td>
</tr>
</table>
</div>
</div>