Trapezoid table in HTML and CSS - html

Question

I'd like to make an IPA vowel diagram like this one:
I have made a table with 7 rows and 5 columns in HTML, but how do I change the shape of the table to trapezoid using CSS?
I know that it's possible to draw a trapezoid in a graphics editor and then use the resulting image as a background in HTML, but I'd like to do do this with pure CSS if possible.
<table>
<tr>
<th>1</th>
<th>2</th>
<th>3</th>
<th>4</th>
<th>5</th>
</tr>
<tr>
<td>6</td>
<td>7</td>
<td>8</td>
<td>9</td>
<td>10</td>
</tr>
<tr>
<td>11</td>
<td>12</td>
<td>13</td>
<td>14</td>
<td>15</td>
</tr>
<tr>
<td>16</td>
<td>17</td>
<td>18</td>
<td>19</td>
<td>20</td>
</tr>
<tr>
<td>21</td>
<td>22</td>
<td>23</td>
<td>24</td>
<td>25</td>
</tr>
<tr>
<td>26</td>
<td>27</td>
<td>28</td>
<td>29</td>
<td>30</td>
</tr>
<tr>
<td>31</td>
<td>32</td>
<td>33</td>
<td>34</td>
<td>35</td>
</tr>
</table>

Answer 1

you can use css like this to make shapes and build the table. Is dont think there i an other way to be honest.
#trapezoid {
border-bottom: 100px solid red;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
height: 0;
width: 100px;
}
next time try to show us what you DID try to get the result.

Answer 2

I think that the closest that you can get with CSS is using some 3d perspective:
table {
transform: translate(100px, 130px) perspective(200px) rotateX(-40deg);
transform-origin: bottom right;
transform-style: preserve-3d;
}
td,
th {
transform: rotateX(40deg);
backface-visibility: hidden;
}
<table>
<tr>
<th>1</th>
<th>2</th>
<th>3</th>
<th>4</th>
<th>5</th>
</tr>
<tr>
<td>6</td>
<td>7</td>
<td>8</td>
<td>9</td>
<td>10</td>
</tr>
<tr>
<td>11</td>
<td>12</td>
<td>13</td>
<td>14</td>
<td>15</td>
</tr>
<tr>
<td>16</td>
<td>17</td>
<td>18</td>
<td>19</td>
<td>20</td>
</tr>
<tr>
<td>21</td>
<td>22</td>
<td>23</td>
<td>24</td>
<td>25</td>
</tr>
<tr>
<td>26</td>
<td>27</td>
<td>28</td>
<td>29</td>
<td>30</td>
</tr>
<tr>
<td>31</td>
<td>32</td>
<td>33</td>
<td>34</td>
<td>35</td>
</tr>
</table>