The height of the table cell is not being preserved properly, resulting in the background being duplicated

Currently, I am enclosing my form within a table structure.

The table consists of 9 cells arranged in 3 rows and 3 columns. In this arrangement, [0,0] represents the top left corner, [1,1] is considered as main form content, and [2,2] signifies the bottom right corner (all following a zero-indexed format as described). The primary reason for wrapping my form with a table is to incorporate a 'drop shadow' effect around it.

However, I have encountered an issue where the cells in row 0 and row 2 are intended to be 8px in height but instead appear as 22px high.

For aesthetical purposes, I aim to display rounded edges using the four corner cells of the table. Meanwhile, the remaining four 'edge' cells repeat a background pattern, with dimensions of 1px either vertically or horizontally depending on the repetition orientation. Yet, in cases where they 'repeat-x' within row 0 and row 2, the table data elements do not adhere to the desired height accurately.

In terms of browser compatibility, initially, only IE displayed this issue specifically in 'IE 7/8' compatibility view. However, more recently, both Chrome and Firefox have started exhibiting similar behavior, potentially due to the influence of my DOCTYPE declaration.

To elaborate further, I have included a partial screenshot along with some HTML snippets edited to eliminate extensive Web Resource URLs that lead to complexity (especially when developing this as a web control).

<table cellpadding=0 cellspacing=0 border=0 style="width:560px;">
<tr>
    <td style="background-image:url('url'); width:8px; height:8px;">
        <img src='url' width='8' height='8'/>
    </td>   
    <td style="background-image:url('url'); height:8px;">
        <img src='url' height='8'/>
    </td>   
    <td  style="background-image:url('url'); width:9px; height:8px;">
        <img src='url' width='9' height='8'/>
    </td>
</tr>
<tr>
    <td style="background-image:url('url'); width:8px;">
    </td>
    <td  style="background-color:#DDDDDD">
        <!-- main table content !-->
    </td>
    <td style="background-image:url('url')">
    </td>
</tr>
<tr>
    <td style="background-image:url('url') width='8' height='9'>
        <img src='url' width='8' height='9'/>
    </td>
    <td style="background-image:url('url') height='9'>
    </td>
    <td style="background-image:url('url'); width:9px; height:9px;">
        <img src='url' width='9' height='9'/>
    </td>

</tr>

</table>    

In previous encounters, issues related to tables not maintaining correct height or width were addressed by ensuring minimal text or characters influencing unintended height alterations, along with avoiding empty table cells. Notably, attempts such as incorporating background images through image tags within cells have rendered ineffective solutions.

Hence, it is my anticipation that this dilemma aligns with commonly known HTML challenges. Your insights and assistance in resolving this matter are greatly appreciated.

Answer №1

While typically I discourage the use of tables for layout purposes, there are instances where no better alternative exists (perhaps until border-image gains better support). However, it's important to note that according to the HTML5 specification, if a table is used for layout, it should be assigned the role="presentation" attribute for accessibility reasons such as screen readers (for example, aiding users with visual impairments). Despite this consideration, using tables for layout may still present challenges for these users and search engine functionality.

Furthermore, employing inline styles like your approach can lead to difficulties in maintenance. It's recommended to utilize an external stylesheet and include it using

<link rel="stylesheet" type="text/css" href="URL.css"/>
. By utilizing the class and id attributes, styling elements like tables becomes more manageable.

You mentioned concerns about potential issues caused by your doctype, although you did not provide it here. Generally, opting for the HTML5 doctype—simply <!DOCTYPE html>—is advisable. Older HTML 4.x/XHTML 1.x/etc. doctypes are likely less optimal choices.

Combining all of these recommendations, your HTML code could resemble something similar to the following:

<!DOCTYPE html>
<html>
    <head>
        <!-- Other necessary header content like meta tags or title -->
        <link rel="stylesheet" type="text/css" href="something.css"/>
    </head>

    <body>

        <table id="mainLayout" role="presentation">
            <thead>
                <tr>
                    <td class="left-cell"></td>
                    <td></td>
                    <td class="right-cell"></td>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td class="left-cell"></td>
                    <td><!-- Main content goes here. --></td>
                    <td class="right-cell"></td>
                </tr>
            </tbody>
            <tfoot>
                <tr>
                    <td class="left-cell"></td>
                    <td></td>
                    <td class="right-cell"></td>
                </tr>
            </tfoot>
        </table>

    </body>
</html>

Regarding the CSS styling:

.left-cell and .right-cell, take precedence over less-specific ones. Therefore, having a .center-cell rule might not be necessary.

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