Strange problems with div borders when swimming

Question

Can I get an explanation of why this code gives the result? And a way to fix / get around it, if possible.

I do not want divs 'z' and 'q' to cross the “blue border of the div” to the right.

Or

I would like div 'x' to match "z" and "q", and also go through the blue right border.

<div style='margin: 5px;width: 653px;border: blue 1px solid;float: left;'>
    <div style='margin: 0px; margin-bottom: 5px;width: 100%;border: red 1px solid;/*float: left;*/'>z</div>
    <div style='overflow: hidden;margin: 0px; margin-bottom: 5px;width: 100%;border: red 0px solid;/*float: left;*/'>
            <div style='margin: 0px; margin-bottom: 0px;width: 300px;border: red 1px solid;float: left;'>y</div>
            <div style='margin: 0px; margin-bottom: 0px;width: 300px;border: red 1px solid;float: right;'>x</div>
    </div>
     <div style='margin: 0px; margin-bottom: 5px;width: 100%;border: red 1px solid;/*float: left;*/'>q</div>

Answer 1

Which browser did you create the screenshot? If it is IE, there is a problem with the window model, which causes the border width to be ignored when calculating 100% of the width.

Either create an invisible container to the size of the inner div, or the size of your inner div on container.width -2.

: 100%; div.

Answer 2

- , z q...

, (margin margin-bottom), - - , , , :

<div style="margin: 5px;width: 653px;border: blue 1px solid;float: left;"><div style="margin: 5px;width: 100%;border: red 1px solid;">z</div><div style="overflow: hidden;margin: 5px;width: 100%;border: red 0px solid;"><div style="margin: 0px;width: 300px;border: red 1px solid;float: left;">y</div><div style="margin: 0px;width: 300px;border: red 1px solid;float: right;">x</div></div><div style="margin: 5px;width: 100%;border: red 1px solid;">q</div>

Answer 3

, , .

, . .

http://jsfiddle.net/mayankipsa/e7snvdag/

.floatLeft { float: left;}
.floatRight { float: right;}
.clearBOTH { clear: both; }

.redBorder{border:1px solid red;}
.blueBorder{border:1px solid blue;}

.x,.y{width:49%;margin:1px; }
.z{margin:1px;}
.q{margin:1px;}

<div style='margin: 5px;width: 653px;border: blue 1px solid;float: left;'>
    <div style='margin: 0px; margin-bottom: 5px;width: 100%;border: red 1px solid;/*float: left;*/'>z</div>
    <div style='overflow: hidden;margin: 0px; margin-bottom: 5px;width: 100%;border: red 0px solid;/*float: left;*/'>
            <div style='margin: 0px; margin-bottom: 0px;width: 300px;border: red 1px solid;float: left;'>y</div>
            <div style='margin: 0px; margin-bottom: 0px;width: 300px;border: red 1px solid;float: right;'>x</div>
    </div>
     <div style='margin: 0px; margin-bottom: 5px;width: 100%;border: red 1px solid;/*float: left;*/'>q</div>
</div>

<div class="clearBOTH"></div>
<div class="blueBorder" style="margin-top:50px;">
    <div class="z redBorder">z</div>
    <div class="redBorder">
        <div class="y floatLeft redBorder">y</div>
        <div class="x floatRight redBorder">x</div>
        <div class="clearBOTH"></div>
    </div>
    <div  class="q redBorder">q</div>
</div>

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