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Editorial Team
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Asked: 2026-06-15T19:55:06+00:00

I made a menu, and just now I added <!DOCTYPE html> to the document,

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I made a menu, and just now I added

<!DOCTYPE html>

to the document, and it ceases to function. However the code is still running, will still print to console on mouseover etc. I tried other doctypes and they break it too, it just stays static.

What is it about a doctype that could cause JavaScript to not work?

JS:

var total_width = "960";
var slide_width = "182";
var slide_margin = "10";
var expand_width = "374";
var icon_width = "32";
var icon_margin = "15";
var slide_number = "5";

function slideid(i) {
    var m = document.getElementById("slide"+i);
    var l = document.getElementById("slideimg"+i);
    var k = document.getElementById("slidetext"+i);
    var j = document.getElementById("slidediv"+i);
    return [m, l, k, j]
}

function compat() {
    if (window.opera) {
        for (var i=1;i<6;i++) {
            s = slideid(i);
            s[3].style.position="relative";
            s[3].style.bottom="46px";
        }
    }
    if (document.all && !(window.opera)) {
        for (var i=1;i<6;i++) {
            s = slideid(i);
            s[0].style.height="60px";
            s[1].style.display="none";
            var iecontents = s[2].innerHTML;
            s[0].innerHTML=iecontents;
            s[0].style.fontFamily="'astonishedregular',Impact,serif";
            s[0].style.fontSize="40px";
            s[0].style.color="#fff";
            s[0].style.textDecoration="none";
            s[0].style.padding="10px auto";
        }
    }
}

function expand(x) {
    if (document.all && !(window.opera)) {
        return
    }
    var shrink = new Array();
    for (var i=1;i<6;i++) {
        if (i === x) {
            var expander = i;
        }
        else {
            var d = shrink.length;
            shrink[d] = i;
        }
    }
    for (var i=0;i<4;i++) {
        s = slideid(shrink[i]);
        var slide_shrink = ((total_width-(5*slide_margin))-expand_width)/(slide_number-1);
        s[1].style.marginLeft=(slide_shrink-icon_width)/2;
        s[0].style.width=slide_shrink;
        s[2].style.display="none";
        s[3].style.width="0"
    }
    s = slideid(expander);
    s[1].style.marginLeft=icon_margin;
    s[0].style.width=expand_width;
    s[2].style.display="inline-block";
    s[3].style.width=expand_width-icon_width-icon_margin-7;
}

function shrink() {
    if (document.all && !(window.opera)) {
        return
    }
    for (var i=1;i<6;i++) {
        s = slideid(i);
        s[1].style.marginLeft=(slide_width-icon_width)/2;
        s[0].style.width=slide_width;
        s[2].style.display="none";
        s[3].style.width="0";
    }
}

And HTML:

<!DOCTYPE html>
<head>
    <link rel="stylesheet" href="style.css" />
    <script src="menu.js"></script>
</head>
<body onload="compat()">

<div id="Menu" onMouseout="shrink()">
    <a href="#" class="slide" id="slide1" onMouseOver="expand(1)">
        <img id="slideimg1" src="home.png" />
        <div id="slidediv1">
            <h2 id="slidetext1">Home</h2>
        </div>
    </a>
    <a href="#" class="slide" id="slide2" onMouseOver="expand(2)">
        <img id="slideimg2" src="sound.png" />
        <div id="slidediv2">
            <h2 id="slidetext2">Music</h2>
        </div>
    </a>
    <a href="#" class="slide" id="slide3" onMouseOver="expand(3)">
        <img id="slideimg3" src="blog.png" />
        <div id="slidediv3">
            <h2 id="slidetext3">Blog</h2>
        </div>
    </a>
    <a href="#" class="slide" id="slide4" onMouseOver="expand(4)">
        <img id="slideimg4" src="note.png" />
        <div id="slidediv4">
            <h2 id="slidetext4">Bio</h2>
        </div>
    </a>
    <a href="#" class="slide" id="slide5" onMouseOver="expand(5)">
        <img id="slideimg5" src="way.png" />
        <div id="slidediv5">
            <h2 id="slidetext5">Links</h2>
        </div>
    </a>
</div>
</body>
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1 Answer

  1. Editorial Team

    You need to add "px" to marginLeft and width. Setting CSS style which requires units will not work without unit. And you are missing <html></html> tags.

    function expand(x) {
    if (document.all && !(window.opera)) {
        return
    }
    var shrink = new Array();
    for (var i=1;i<6;i++){
        if (i === x) {
            var expander = i;
        }
        else {
            var d = shrink.length;
            shrink[d] = i;
        }
    }
    for (var i=0;i<4;i++){
        s = slideid(shrink[i]);
        var slide_shrink = ((total_width-(5*slide_margin)) - expand_width) / (slide_number-1);
        s[1].style.marginLeft=(slide_shrink-icon_width)/2 +"px";
        s[0].style.width=slide_shrink +"px";
        s[2].style.display="none";
        s[3].style.width="0"
    }
    s = slideid(expander);
    s[1].style.marginLeft=icon_margin +"px";
    s[0].style.width=expand_width + "px";
    s[2].style.display="inline-block";
    s[3].style.width= (expand_width-icon_width-icon_margin-7) +"px";
}

function shrink() {
    if (document.all && !(window.opera)) {
        return
    }
    for (var i=1;i<6;i++){
        s = slideid(i);
        s[1].style.marginLeft=(slide_width-icon_width)/2 +"px";
        s[0].style.width=slide_width + "px";
        s[2].style.display="none";
        s[3].style.width="0";
    }
}
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