MDN Search Filtering

Restores search topic filtering to MDN; for much better search results!
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// ==UserScript==
// @name        MDN Search Filtering
// @namespace   Violentmonkey Scripts
// @match       https://developer.mozilla.org/*
// @grant       none
// @version     1.5
// @author      John Bussjaeger
// @description Restores search topic filtering to MDN; for much better search results!
// @homepageURL https://github.com/bussdriver/MDN-enhancer
// ==/UserScript==

var filters=    ["all","api","addons","css","canvas","firefox","firefox-os","games","html","http","js","marketplace","mathml","mobile","apps","svg","webdev","standards","webext","webgl","docs","xpcom","xul"];
var localized=  {//map to filters + url + url_title
    'en':["All"//special case
     ,"APIs and DOM","Add-ons & Extensions","CSS","Canvas","Firefox","Firefox OS","Games","HTML","HTTP","JavaScript","Marketplace","MathML","Mobile","Open Web Apps","SVG","Web Development","Web Standards","WebExtensions","WebGL","Writing Documentation","XPCOM","XUL"
    ,"Search Topics","http://kb.mozillazine.org/Using_keyword_searches","Keyword Searching"]
};
localized=      localized[ navigator.language ] || localized[ navigator.language.split('-')[0] ] || localized.en;

//existing document elements:
var form=       document.getElementById('nav-main-search') || document.querySelector('form.search-form');
var input=      document.getElementById('main-q');

//CSS
var style=      getComputedStyle(form);
var x=          document.createElement('style');
document.head.appendChild(x);
var s=			'.search-results-filters {position: absolute;left:calc( '+ ( style.borderBottomLeftRadius ? style.borderBottomLeftRadius : style.paddingLeft +' + '+ style.borderLeftWidth +' + '+ style.borderLeftWidth )  +' );top: calc( '+ style.height +' - '+ style.borderBottomWidth +' );'
+`position: absolute;border:inherit;border-bottom-left-radius: inherit;border-bottom-right-radius: inherit;background-color: #fff;padding: 8px;border-top-width:0;z-index:9;margin:0;}
.search-results-filters label {display:block;padding-bottom:10px;}
.page-header {z-index:9;}
@media all and (min-width:47.9385em) and (max-width: 74.9375em) {
	.page-header .main-nav {grid-row:1/1;grid-column:2/3;}
	.page-header .header-search {grid-row:2/2;grid-column:2/3;}
}
@media all and (max-width:47.9375em) {
	.search-results-filters{top:calc(1.6em + 22px);border:thin solid #000;}
}`;
if( style.borderTopStyle === 'none' ){
	var y=		getComputedStyle(input);
	s+=			'\n.search-results-filters {border:'+
		y.borderTopStyle + ' '+ y.borderTopWidth +' '+ y.borderTopColor
	+';}';
}
x.innerHTML=	s;
var fset=       document.createElement('fieldset');
fset.className= "search-results-filters";
fset.style.display= "none";
var legend=     document.createElement('b');
legend.appendChild(document.createTextNode( localized[localized.length-3] ));// "search topics"
fset.appendChild(legend);

var checklist=  [];
var all;
for(var item,check,i=0;i<filters.length;++i){
    x=          filters[i];
    item=       document.createElement('label');
    check=      document.createElement('input');
    check.type= "checkbox";
    check.name= "topic";
    check.value=    x;
    if( (location+'').indexOf('topic='+x) >=0 ){
        check.checked=  true;
    }
    check.addEventListener('click',function(e){
        e.target.focus();//click should focus so submit can work
    },false);
    if(x==='all'){//"all" special case
        all=    check;
        check.name='';
        if(  (location+'').indexOf('topic=') === -1 ){
             check.checked=  true;
        }
        check.addEventListener('change',function(e){
            if( e.target.checked ){
                for(var i=checklist.length;--i>=0;){
                    checklist[i].checked=false;
                }
            }
        },false);
    }else{
        checklist.push(check);
        check.addEventListener('change',function(e){
            if( e.target.checked ){
                all.checked=    false;
            }
        },false);
    }
    item.appendChild(check);
    item.appendChild(document.createTextNode(" "+ localized[i]));
    fset.appendChild(item);
}

item = document.createElement('hr');
fset.appendChild(item);

item = document.createElement('a');
item.innerText=     localized[localized.length-1];// "keyword searching"
item.href=          localized[localized.length-2];// url help on keyword searching
fset.appendChild(item);

form.appendChild(fset);
form.addEventListener('mouseover',function(){fset.style.display="block"},false);
form.addEventListener('mouseout',function(){fset.style.display="none"},false);

input.setAttribute('autocomplete','off');
input.addEventListener('focus',function(){fset.style.display="block"},false);
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