Resizing nested elements while maintaining consistent padding dimensions

If you're looking to create a sleek foundation for a 200px wide, 30px high editable combobox that can be easily used with angular binding or other JavaScript data-binding solutions, consider the following HTML code. However, there's a desire to make the outermost div 100% wide and have the 180px wide div use padding instead of an explicit size. Unfortunately, it seems like padding is being ignored in this case. Are there any insights into why this might be happening, and are there effective workarounds available? (preferably using CSS/HTML)

<style>
    .comboboxOuterDiv {
        padding:0px; 
        margin:0px; 
        border:0px; 
        height:30px; 
        width:200px; 
        position:relative;
    }
    .comboboxSelectDiv {
         height:100%; 
         width:100%; 
         position:absolute; 
         top:0px; 
         left:0px; 
         z-index:0;
    }
    .comboboxSelect {
        height:100%; 
        width:100%; 
        position:absolute; 
        top:0px; 
        left:0px;
    }
    .comboboxTextDiv {
        height:100%; 
        width:180px; 
        position:absolute; 
        top:0px; 
        left:0px; 
        z-index:1;
    }
    .comboboxText {
         height:100%; 
         width:100%; 
         position:absolute; 
         top:0px; 
         left:0px; 
    }
</style>
<div class="comboboxOuterDiv">
    <div class="comboboxSelectDiv">
        <select class="comboboxSelect">
            <option value="a_value">A Value</option>
        </select>
    </div>
    <div class="comboboxTextDiv">
        <input class="comboboxText" type="text"/>
    </div>
</div>

Answer №1

For those who are curious, here is a functional example:

<style>
    .customComboBoxOuterDiv {
        padding:0px; 
        margin:0px; 
        border:0px; 
        height:30px; 
        width:100%; 
        position:relative;
        overflow:hidden;
    }
    .customComboBoxSelectDiv {
         height:100%; 
         width:100%; 
         position:relative; 
         top:0px; 
         left:0px; 
         z-index:0;
    }
    .customComboBoxSelect {
        height:100%; 
        width:100%; 
        position:absolute; 
        top:0px; 
        left:0px;
    }
    .customComboBoxTextDiv {
        display:block;
        height:100%; 
        width:auto; 
        position:absolute; 
        top:0px; 
        left:0px; 
        right:20px;
        z-index:1;
    }
    .customComboBoxText {
         height:100%; 
         width:100%; 
         position:absolute; 
         top:0px; 
         left:0px; 
    }
</style>
<div class="customComboBoxOuterDiv">
    <div class="customComboBoxSelectDiv">
        <select class="customComboBoxSelect">
            <option value="a_value">A Value</option>
        </select>
    </div>
    <div class="customComboBoxTextDiv">
        <input class="customComboBoxText" type="text"/>
    </div>
</div>

Answer №2

I have made modifications to your code!

Take a look and let me know if it meets your expectations!

View the demo on jsfiddle

I adjusted the height of the comboboxText class to be 80%

Additionally, I set the width of the comboboxTextDiv class to a fixed value, like auto

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