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    copied!<p>To build on top of <a href="https://stackoverflow.com/questions/1303729/iframe-100-height-inside-body-with-padding/1305171#1305171">bobince's answer</a>:</p> <p><a href="http://erik.eae.net/" rel="nofollow noreferrer">Erik Arvidsson</a> came up with a way to (kinda, sorta) add <a href="http://webfx.eae.net/dhtml/boxsizing/boxsizing.html" rel="nofollow noreferrer">box-sizing support to IE6/IE7</a>. However, his solution doesn't support units other than <code>px</code>. Like you, I needed a percentage height, so I added support for percents.</p> <p>Once you've downloaded and unzipped the <a href="http://webfx.eae.net/dhtml/boxsizing/boxsizing.zip" rel="nofollow noreferrer">zip file</a>, open boxsizing.htc and replace the following border/padding functions:</p> <pre><code>/* border width getters */ function getBorderWidth(el, sSide) { if (el.currentStyle["border" + sSide + "Style"] == "none") return 0; var n = parseInt(el.currentStyle["border" + sSide + "Width"]); return n || 0; } function getBorderLeftWidth() { return getBorderWidth((arguments.length &gt; 0 ? arguments[0] : element), "Left"); } function getBorderRightWidth() { return getBorderWidth((arguments.length &gt; 0 ? arguments[0] : element), "Right"); } function getBorderTopWidth() { return getBorderWidth((arguments.length &gt; 0 ? arguments[0] : element), "Top"); } function getBorderBottomWidth() { return getBorderWidth((arguments.length &gt; 0 ? arguments[0] : element), "Bottom"); } /* end border width getters */ /* padding getters */ function getPadding(el, sSide) { var n = parseInt(el.currentStyle["padding" + sSide]); return n || 0; } function getPaddingLeft() { return getPadding((arguments.length &gt; 0 ? arguments[0] : element), "Left"); } function getPaddingRight() { return getPadding((arguments.length &gt; 0 ? arguments[0] : element), "Right"); } function getPaddingTop() { return getPadding((arguments.length &gt; 0 ? arguments[0] : element), "Top"); } function getPaddingBottom() { return getPadding((arguments.length &gt; 0 ? arguments[0] : element), "Bottom"); } /* end padding getters */ </code></pre> <p>Then replace <code>updateBorderBoxWidth</code> and <code>updateBorderBoxHeight</code> with the following:</p> <pre><code>function updateBorderBoxWidth() { element.runtimeStyle.width = ""; if (getDocumentBoxSizing() == getBoxSizing()) return; var csw = element.currentStyle.width; var w = null; if (csw != "auto" &amp;&amp; csw.indexOf("px") != -1) { w = parseInt(csw); } else if (csw != "auto" &amp;&amp; csw.indexOf("%") != -1) { var origDisplay = element.runtimeStyle.display; element.runtimeStyle.display = "none"; w = Math.max(0, (parseInt(element.parentNode.clientWidth) - ( getBorderLeftWidth(element.parentNode) + getPaddingLeft(element.parentNode) + getPaddingRight(element.parentNode) + getBorderRightWidth(element.parentNode) )) * (parseInt(csw) / 100)); element.runtimeStyle.display = origDisplay; } if (w !== null) { if (getBoxSizing() == "border-box") { setBorderBoxWidth(w); } else { setContentBoxWidth(w); } } } function updateBorderBoxHeight() { element.runtimeStyle.height = ""; if (getDocumentBoxSizing() == getBoxSizing()) return; var csh = element.currentStyle.height; var h = null; if (csh != "auto" &amp;&amp; csh.indexOf("px") != -1) { h = parseInt(csh); } else if (csh != "auto" &amp;&amp; csh.indexOf("%") != -1) { var origDisplay = element.runtimeStyle.display; element.runtimeStyle.display = "none"; h = Math.max(0, (parseInt(element.parentNode.clientHeight) - ( getBorderTopWidth(element.parentNode) + getPaddingTop(element.parentNode) + getPaddingBottom(element.parentNode) + getBorderBottomWidth(element.parentNode) )) * (parseInt(csh) / 100)); element.runtimeStyle.display = origDisplay; } if (h !== null) { if (getBoxSizing() == "border-box") { setBorderBoxHeight(h); } else { setContentBoxHeight(h); } } } </code></pre> <p>Then just use the file as you would otherwise:</p> <pre><code>.border-box { behavior: url("boxsizing.htc"); box-sizing: border-box; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; } </code></pre> <p>Here's a pretty thorough test I put together while developing my modifications:</p> <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;box-sizing: border-box;&lt;/title&gt; &lt;style type="text/css"&gt; html, body { margin: 0; padding: 0; width: 100%; height: 100%; background: yellow; } body { padding-top: 50px; padding-bottom: 50px; } p { margin: 0; } #header, #footer { height: 50px; position: absolute; width: 100%; overflow: hidden; } #header { background: red; top: 0; } #footer { background: blue; bottom: 0; } #content { width: 100%; height: 100%; border: none; margin: 0; padding: 0; background: black; color: white; overflow: auto; position: relative; padding-top: 40px; padding-bottom: 40px; } #nested-header, #nested-footer { position: absolute; height: 40px; width: 100%; background: #CCC; } #nested-header { top: 0; } #nested-footer { bottom: 0; } #nested-content-wrap { height: 100%; } #nested-floater { height: 100%; float: left; width: 100px; } #nested-content { height: 100%; background: green; color: black; overflow: auto; position: relative; } #inner-nest { height: 100%; position: relative; } #inner-head { height: 30px; width: 100%; background: #AAA; position: absolute; top: 0; } #inner-content { padding-top: 30px; height: 100%; overflow: auto; } .border-box { behavior: url("boxsizing.htc"); box-sizing: border-box; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; } .content-box { behavior: url("boxsizing.htc"); box-sizing: content-box; -moz-box-sizing: content-box; -webkit-box-sizing: content-box; } legend { color: black; } form { margin: 1em 0; } .wrap { height: 100px; background: #000; overflow: hidden; } .test { width: 100px; height: 100%; background: #AAA; border-color: #EEE; padding-left: 20px; padding-top: 20px; padding-bottom: 5px; float: left; } .fill { width: 100%; height: 100%; background: #CCC; } .gauge { width: 99px; background: white; border-right: 1px solid green; height: 100%; float: left; } .notes { background: #8FC561; } .clear { clear: both; } /* 120px x 120px square; this will create a black 20px frame on the inside */ .boxtest-wrapper { width: 100px; height: 100px; float: left; background: black; color: white; margin: 1em; padding: 20px; } #boxtest-4-container { width: 100%; height: 100%; } .boxtest { width: 100%; height: 100%; background: white; color: black; border: 5px solid green; overflow: hidden; } &lt;/style&gt; &lt;script type="text/javascript"&gt; function addBorderBox() { var wrap1 = document.getElementById("wrap-1"); var wrap2 = document.getElementById("wrap-2"); var borderBox = document.createElement("div"); borderBox.className = "test border-box"; var borderBoxFill = document.createElement("div"); borderBoxFill.className = "fill"; var borderBoxContent = document.createTextNode("Generated border box fill"); borderBoxFill.appendChild(borderBoxContent); borderBox.appendChild(borderBoxFill); var gauge = document.createElement("div"); gauge.className = "gauge"; var gaugeText1 = "width: 100px"; var gaugeText2 = "height: 100%"; var gaugeText3 = "bottom should be visible"; gauge.appendChild(document.createTextNode(gaugeText1)); gauge.appendChild(document.createElement("br")); gauge.appendChild(document.createTextNode(gaugeText2)); gauge.appendChild(document.createElement("br")); gauge.appendChild(document.createTextNode(gaugeText3)); wrap1.appendChild(borderBox); wrap2.appendChild(gauge); } &lt;/script&gt; &lt;/head&gt; &lt;body id="body" class="border-box"&gt; &lt;div id="header"&gt; &lt;p&gt;Header - 50px;&lt;/p&gt; &lt;/div&gt; &lt;div id="content" class="border-box"&gt; &lt;div id="nested-header"&gt; &lt;p&gt;Nested Header - 40px;&lt;/p&gt; &lt;/div&gt; &lt;div id="nested-content-wrap"&gt; &lt;div id="nested-floater"&gt; &lt;p&gt;Float - 100px;&lt;/p&gt; &lt;ul&gt; &lt;li&gt;This element should never scroll.&lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; &lt;div id="nested-content"&gt; &lt;div id="inner-nest"&gt; &lt;div id="inner-head"&gt; &lt;p&gt;Inner Head - 30px;&lt;/p&gt; &lt;/div&gt; &lt;div id="inner-content" class="border-box"&gt; &lt;div style="float: right; "&gt; &lt;p&gt;The fourth square should look just like the other three:&lt;/p&gt; &lt;div id="boxtest-wrapper-1" class="boxtest-wrapper"&gt; &lt;div id="boxtest-1" class="boxtest border-box"&gt;&lt;/div&gt; &lt;/div&gt; &lt;div id="boxtest-wrapper-2" class="boxtest-wrapper"&gt; &lt;div id="boxtest-2" class="boxtest border-box"&gt;&lt;/div&gt; &lt;/div&gt; &lt;br class="clear" /&gt; &lt;div id="boxtest-wrapper-3" class="boxtest-wrapper"&gt; &lt;div id="boxtest-3" class="boxtest border-box"&gt;&lt;/div&gt; &lt;/div&gt; &lt;div id="boxtest-wrapper-4" class="boxtest-wrapper"&gt; &lt;div id="boxtest-4-container"&gt; &lt;!-- boxtest-4-container isn't special in any way. it just has width and height set to 100%. --&gt; &lt;div id="boxtest-4" class="boxtest border-box"&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;p&gt;Inner Content - fluid&lt;/p&gt; &lt;ul&gt; &lt;li&gt;The top of the scrollbar should be covered by the &amp;ldquo;Inner Head&amp;rdquo; element.&lt;/li&gt; &lt;li&gt;The bottom of the scrollbar should be visible without having to scroll &amp;ldquo;Inner Head&amp;rdquo; out of view.&lt;/li&gt; &lt;/ul&gt; &lt;p&gt;Document Compat Mode: &lt;strong id="compatMode"&gt; &lt;script type="text/javascript"&gt; var compatMode = document.compatMode; if (compatMode != "CSS1Compat") { document.getElementById("compatMode").style.color = "red"; } document.write(compatMode); &lt;/script&gt; &lt;/strong&gt; &lt;/p&gt;&lt;br /&gt; &lt;div class="notes"&gt; &lt;h2&gt;Notes&lt;/h2&gt; &lt;ul&gt; &lt;li&gt;In IE6 and IE7 (and possibly IE8; untested), you'll notice a slight shift of contents that have &lt;code&gt;box-sizing&lt;/code&gt; set to &lt;code&gt;border-box&lt;/code&gt;. This is the amount of time it takes for &lt;a href="box-sizing.htc"&gt;box-sizing.htc&lt;/a&gt; to finish downloading.&lt;/li&gt; &lt;li&gt;This workaround is not live. Anything that causes a &lt;a href="http://www.phpied.com/rendering-repaint-reflowrelayout-restyle/"&gt;reflow or repaint&lt;/a&gt; will not currently trigger an update to widths and heights of &lt;code&gt;border-box&lt;/code&gt; elements.&lt;/li&gt; &lt;li&gt;See &lt;a href="http://webfx.eae.net/dhtml/boxsizing/boxsizing.html"&gt;http://webfx.eae.net/dhtml/boxsizing/boxsizing.html&lt;/a&gt; for the original solution to the IE6/IE7 &lt;code&gt;border-box&lt;/code&gt; problem. &lt;a href="box-sizing.htc"&gt;box-sizing.htc&lt;/a&gt; has been modified to allow for percentage widths and heights.&lt;/li&gt; &lt;li&gt;To see what this example should look like without the use of &lt;a href="box-sizing.htc"&gt;box-sizing.htc&lt;/a&gt;, view it in Firefox or IE8.&lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; &lt;br class="clear" /&gt; &lt;form&gt; &lt;fieldset&gt; &lt;legend&gt;DOM Update Test&lt;/legend&gt; &lt;input type="button" value="Click to add border-box" onclick="addBorderBox(); " /&gt; &lt;/fieldset&gt; &lt;/form&gt; &lt;div id="wrap-1" class="wrap"&gt; &lt;div class="test content-box" id="content-box-1" style="border-width: 5px; border-style: solid;"&gt; &lt;div class="fill"&gt;Content box fill&lt;/div&gt; &lt;/div&gt; &lt;div class="test content-box" id="content-box-2" style="border-width: 5px; border-style: solid; padding: 5px;"&gt; &lt;div class="fill"&gt;Content box fill&lt;/div&gt; &lt;/div&gt; &lt;div class="test border-box" id="border-box-1" style="border-width: 5px; border-style: solid;"&gt; &lt;div class="fill"&gt;Border box fill&lt;/div&gt; &lt;/div&gt; &lt;div class="test border-box" id="border-box-2" style="border-width: 5px; border-style: solid; padding: 5px;"&gt; &lt;div class="fill"&gt;Border box fill&lt;/div&gt; &lt;/div&gt; &lt;div class="test" id="default-box-1" style="border-width: 5px; border-style: solid;"&gt; &lt;div class="fill"&gt;Default box fill&lt;/div&gt; &lt;/div&gt; &lt;div class="test" id="default-box-2" style="border-width: 5px; border-style: solid; padding: 5px;"&gt; &lt;div class="fill"&gt;Default box fill&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;div id="wrap-2" class="wrap"&gt; &lt;!-- subtract 1 from width for 1px right border --&gt; &lt;div class="gauge" style="width: 129px;"&gt;width: 130px&lt;br /&gt;height: 100%&lt;br /&gt;bottom should be cut off&lt;/div&gt; &lt;div class="gauge" style="width: 119px;"&gt;width: 120px&lt;br /&gt;height: 100%&lt;br /&gt;bottom should be cut off&lt;/div&gt; &lt;div class="gauge"&gt;width: 100px&lt;br /&gt;height: 100%&lt;br /&gt;bottom should be visible&lt;/div&gt; &lt;div class="gauge"&gt;width: 100px&lt;br /&gt;height: 100%&lt;br /&gt;bottom should be visible&lt;/div&gt; &lt;div class="gauge" style="width: 129px;"&gt;width: 130px&lt;br /&gt;height: 100%&lt;br /&gt;bottom should be cut off&lt;/div&gt; &lt;div class="gauge" style="width: 119px;"&gt;width: 120px&lt;br /&gt;height: 100%&lt;br /&gt;bottom should be cut off&lt;/div&gt; &lt;/div&gt; &lt;br class="clear" /&gt; &lt;script type="text/javascript"&gt; var lipsum = "&lt;p&gt;Lorem ipsum dolor sit amet.&lt;/p&gt;"; for (var i = 0; i &lt; 100; i++) { document.write(lipsum); } &lt;/script&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;div id="nested-footer"&gt; &lt;p&gt;Nested Footer - 40px;&lt;/p&gt; &lt;/div&gt; &lt;/div&gt; &lt;div id="footer"&gt; &lt;p&gt;Footer - 50px;&lt;/p&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
 

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