A default CSS file to give unsupported browsers something other than a totally broken experience of the web. Inspired by Andy Clarke's 2009 'Universal Internet Explorer 6 CSS' 1 2.
To see what your website would look like with HTML4CSS - try the demo tool
In the demo, a website is stripped of its <head>, <style> and <script> tags and a new <head> inserted which hooks up the HTML4CSS.
Responsive images are shim'd using legacypicturefill.
In the <head> of my documents I'm inlining small piece of JavaScript:
(function(d) {
var w = window,
h, s;
var browserSpec = (typeof d.querySelectorAll && 'addEventListener' in w && w.history.pushState && d.implementation.hasFeature('http://www.w3.org/TR/SVG11/feature#BasicStructure', '1.1')) ? 'html5' : 'html4';
// disable all the stylesheets, except the html4css one
function disableSS() {
if (/in/.test(d.readyState)) {
setTimeout(disableSS,9);
} else {
for(var i = 0; i < d.styleSheets.length; i++){
var ss = d.styleSheets[i];
if (ss.title !== 'html4css') {
ss.disabled = true;
}
}
}
}
// FF < 3.6 didn't have document.readyState - hacky shim for it
function disableSSff3() {
if (!d.readyState && d.addEventListener) {
if (d.body) {
setTimeout(function(){
d.readyState = 'complete';
},500);
} else {
setTimeout(disableSSff3,9);
}
}
}
if(browserSpec === 'html4') {
h = d.getElementsByTagName('head')[0];
s = d.createElement('link');
s.rel = 'stylesheet';
s.title = 'html4css';
s.href = '/dist/styles/html4css.css';
h.appendChild(s);
}
})(document);This is to decide on the browser's spec, basically my version of the BBC's 'cutting the mustard test'. If the browser is deemed to be a HTML4 browser I load the HTML4CSS and disable any other stylesheet in the page.
If you find a bug in HTML4CSS, please add it to the issue tracker or fork it, fix it and submit a pull request for it (👍).
Tabs are 2 spaces, its plain CSS with some in-line organisational comments.
I've tested this in a variety of browsers:
- Chrome 15+
- Safari 5.1+
- Firefox 3+
- IE 6+
- Android 4+
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