I'm trying to generate a dynamic table using CSS:
<html>
<head>
  <style>
    div.el1, div.el2 {
        color:white;
        width:70px;height:70px;
        border:0px;
        padding:0px;
        font-size: 10px;
        font-family: "Courier";
    }
    div.el1 {
        background-color: green;
    }
    div.el2 {
        background-color: orange;
    }
    div.tablediv {
        display: table;
        border:0px;
        border-spacing:0px;
        border-collapse:separate;
    }
    div.celldiv {
        display: table-cell;
    }
    div.rowdiv {
        display: table-row;
        width:auto;
    }
</style>
</head>
<body>
<div class="tablediv">
    <div class="rowdiv">
        <div class="celldiv">
            <div class="el1" id="x1y1">ABC</div>
        </div>
        <div class="celldiv">
            <div class="el2" id="x1y2"></div>
        </div>
    </div>
    <div class="rowdiv">
        <div class="celldiv">
            <div class="el1" id="x2y1"></div>
        </div>
        <div class="celldiv">
            <div class="el1" id="x2y2"></div>
        </div>
    </div>
</div>
</body>
</html>
The content of body is dynamically generated and should be displayed as a table. Unfortunately, each cell shifts down if it contains data:
expected   reality
 --- ---    --- ---
|   |   |  |   |   |
 --- ---   |ABC|---
|   |   |  |   |   | 
 --- ---    --- ---
           |   |   |
            --- ---
I'm grateful for any help. Many thanks!
EDIT:
adding vertical-align: middle; to div.celldiv fixed the problem, yet I don't understand the reasons. Especially since the content is still aligned to the top of the cell.