How to add a size form without plogin at proudct page?

I already have the code i need but i do not know where to put it at product pages. I only need  to put a size table for those products needed so i guess not work on the CSS for all pages. But product description menu can't write CSS.

Please provide more details of the size table (including a link to the code) and a working link to a product on your website.

10 minutes ago, paul2009 said:

Please provide more details of the size table (including a link to the code) and a working link to a product on your website.

Here is HTML code 

I put on Product Additional Info

<table id="myTable">
    <table>
    <tr>
    <th>size
    </th>
    <th>S</th>
    <th>L</th>
    <th>M</th>
  </tr>
  <tr>
    <td>in</td>
    <td>1‘'</td>
  </tr>
  <tr>
    <td>CM</td>
    <td>20</td>
  </tr>

Add CSS

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

th, td {
  border: 1px solid #ccc;
  padding: 8px;
  text-align: left;
}

th {
  background-color: #f2f2f2;
}

It shows at the very bottom of my page and i want to move it between my product description.

Thanks for sharing the code. I noted that the HTML you've quoted is incomplete. This may be a copy and paste error but you'll want to check this.

It will be possible to add a table like this to the Product Description using some custom JavaScript. The JavaScript solution will depend on how many tables of data you need to display. For example, does it need to apply the same basic table (and data) to all products, are there different tables for different products. 

57 minutes ago, paul2009 said:

Thanks for sharing the code. I noted that the HTML you've quoted is incomplete. This may be a copy and paste error but you'll want to check this.

It will be possible to add a table like this to the Product Description using some custom JavaScript. The JavaScript solution will depend on how many tables of data you need to display. For example, does it need to apply the same basic table (and data) to all products, are there different tables for different products. 

Thank you for your help! It's my HTML incomplete. Now it works!