I find the fundamentals of calculating CSS width to be perplexing

All:

I am curious about what happens when I set the width of the parent DIV to auto and the width of the child div to 100% - how does the browser determine the width of these DIVs?

<div class="menuframe" style="position: fixed; width:auto; height:auto;">
    <div class="menuitem style="width:100%; height:auto;">item1</div>
    <div class="menuitem style="width:100%; height:auto;">item22</div>
    <div class="menuitem style="width:100%; height:auto;">item333</div>
    <div class="menuitem style="width:100%; height:auto;">item4444</div>
</div>
css

Answer №1

<div class="menuframe" style="background-color: red; position: fixed; width:auto; height:auto;">
    <div class="menuitem" style="background-color: blue; width:100%; height:auto;">item1</div>
    <div class="menuitem" style="background-color: black; width:100%; height:auto;">item22</div>
    <div class="menuitem" style="background-color: green; width:100%; height:auto;">item333</div>
    <div class="menuitem style="width:100%; height:auto;">item4444</div>
</div>

It's evident that this will determine the widest div's width.

Answer №2

To ensure the menuitem divs fill up the entire width of the menuframe, it's important to set the CSS accordingly depending on the desired width of the menuframe.

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