How To Build an Absurdly Backwards Compatible Websiteby@zachflower
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1,052 reads

How To Build an Absurdly Backwards Compatible Website

by Zachary FlowerMay 4th, 2022
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There are no hard and fast rules for keeping a website accessible to everyone, but there are a few basic guidelines and workarounds that I’ve come to rely on. Internet Explorer versions 1 and 2 are the only two I've come across so far that have forsaken me. With a little bit of overhead, you can simply set your server to listen on the float IP, so any request to that particular IP will fall back to your website.

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Let’s face it: the internet is broken.

It feels like so much of the web is composed of clickbait, ads, popups, and a toxic amount of JavaScript that you need a modern computer just to get any value out of it. Remember when low-power computers were created for people who were “just browsing the internet?”

Half of the sites on the internet are so overloaded with tracking scripts, ads, third-party “analytics” platforms, and other junk that they simply crash in the face of sub-par hardware; and don’t even get me started on what they do to “retro” computers.

If the modern web hasn’t been created with aging hardware in mind, what does that mean for the proliferation of e-waste? Is it really so necessary to update your computer every 2–5 years? And, what if you didn’t? What if you couldn’t afford to?

My daily driver is a mid-2012 MacBook Pro that will stop receiving all updates (security included) from Apple by the end of this year. While I personally intend to keep it alive with Linux, this isn’t a path that is readily available to most people. What are most people supposed to do in this situation to save some money and avoid adding more junk to our landfills?

These are the questions I have been asking myself over the last year or so, and while I haven’t come up with many great answers for the general populace, I did make the decision to ensure that my personal website is as backwards compatible as possible.

The Basics

When I say “as backwards compatible as possible,” I mean that my website will be usable on as many browsers, connections, and hardware as I can reasonably support.

But, how exactly am I accomplishing this?

While there are no hard and fast rules for keeping a website accessible to everyone, there are a few basic guidelines and workarounds that I’ve come to rely on.

Missing Host Headers

Did you know that the HTTP/1.0 specification didn’t require a Host header? Up until very recently, I didn't. You see, in HTTP/1.1, the Host request header tells a web server exactly which site it is requesting, giving the Web Master—coolest job title ever, btw—the ability to configure multiple "virtual hosts" on a single server.

In other words, and can be hosted on the same server, while serving up different content. As far as sustainability goes, this is a pretty decent solution, as it allows you to utilize the infrastructure you already have to host multiple websites.

But, you know what doesn’t send a Host header? Internet Explorer versions 1 and 2. Probably more, too, but they are the only two I've come across so far that have forsaken me; which means that, without a workaround, my website is completely inaccessible to all of those IE1 and IE2 users out there. That's literally ones of people that don't have access to sweet, sweet content like this.

Thanks, Microsoft.

So, how do we bring those no-Host rebels into the fold? A second IP.

Thankfully, DigitalOcean offers a handful of free floating IPs that you can assign to a single droplet, which means that my site has second IP address in order to appease those picky, early 90s Windows computers. With a little bit of overhead, you can simply set your server to listen on the float IP, so any request to that particular IP will fall back to your website.

I use the Caddy webserver, so to accomplish an HTTP fallback that will be returned on every request (unless a valid host entry can be matched), simply use http:// as the site address:

http:// {
  root * /www/

No Automatic HTTPS

To be absolutely clear here, I am not advocating for not supporting HTTPS.

It’s 2022.

That would be absurd.

But, what I am advocating for is not automatically redirecting to HTTPS. Get your certs, encrypt that traffic, do all the things you normally do… just don’t force an HTTP => HTTPS redirect on your users.

Don’t get me wrong, HTTPS is critical for modern website security, but all modern browsers automatically redirect to HTTPS whether you enforce it or not. What this means is that retro browsers can still load your website in good-ole HTTP, while newer browsers will handle the more secure redirection to HTTPS for you.

If you’re using the Caddy webserver, this is as simple as creating two separate server entries, one with an http:// prefix, and one with an https:// prefix (I’m sure there’s a DRYer way to do this, in which case please yell at me via your preferred choice of digital communication): {
  root * /www/
} {
  root * /www/

Raw HTML is Your Friend

Remember the <FONT> tag? And <TABLE> based layouts? What about <CENTER>? I do. Because the foundation of my website is built using those pre-Y2k web development standards.

As much as modern browsers like to say that they have deprecated some of the aforementioned tags (among other things, like setting a default bgcolor in your BODY tag), they still support the usage because there are enough websites that haven't (and likely never will) upgraded to the homogeneous post Web 2.0 hellscape.

One of the advantages to using these old-school web design methods is that you can still use modern CSS to make things look better on newer devices. Instead of going crazy with flexbox and floats, do a basic layout using tables and then adjust the look with CSS. This gives you the advantage of having a modern-looking website design (if that’s your thing), while also gracefully degrading on older browsers that don’t support it: on Netscape Navigator 3

Use CSS Sparingly

I think it is safe to say that modern CSS simply won’t work with old browsers. I shouldn’t have to go into why that is, but what if you want to have some CSS, just to make things look a tad more pretty for browsers that were released in the last decade?

In general, most browsers (even most legacy ones) will gracefully ignore CSS that they don’t understand, which means that @media tags for things like basic responsiveness and dark mode are usable without any issue. That said, browsers that predate CSS do not know what to do with _<style>_ tags, and as a result simply print the styles out at the top of the page. It's pretty ugly and, depending on how much CSS you have, borderline unusable: on NCSA Mosaic 2.0

To work around this problem, you can put standard HTML comments within the <style> tags, which will get ignored by CSS-supported browsers, while getting interpreted by pre-CSS browsers:

<style type="text/css">
body {
  /* ... */

Gettin’ GIFfy Wit It

Fun fact: the earliest browsers only supported color images of the GIF. I won’t get into the technical details here, but you can blame CompuServe for its creation. This means that, if you want your images to load in any browser, they need to be in GIF format:

GIF image rendered in NCSA Mosaic 2

Neat, right?

Also, not for nothing, but GIF is absolutely pronounced with a soft “G” sound. Scream at me all you want, but it’s what the inventors of the format intended, and I’m a sucker for historical accuracy:

The creators of the format pronounced the acronym GIF as /dʒɪf/, with a soft g as in ‘gin’. Wilhite stated that the intended pronunciation deliberately echoes the American peanut butter brand Jif, and CompuServe employees would often quip “choosy developers choose GIF”, a spoof of Jif’s television commercials.

Unnecessary Improvements

Forgotten Link Tags

There are a number of <link> tags that older browsers support that can be pretty fun to add. For example, the home tag indicates what the homepage for the current website.

<link rel="home" href="" />

In some browsers (such as NCSA Mosaic), this results in a cute little "home" icon at the top of the page that, when clicked, sends you to the designed home URL: on NCSA Mosaic 3

Another useful <link> tag to add is the author tag (refv=made and rel='me authn'). This provides information about the author of the page, usually in the form of a mailto: address. In some browsers—such as Lynx—this tag makes it easy for the user to contact the page author without having to look anything up (or jump to a "contact" page).

<link rev="made" rel="me authn" href="mailto:[email protected]" />

❤ Dithering

Lately, it seems like dithering is all the rage. Personally, I came across it via Low Tech Magazine, but I’ve seen it mentioned more frequently in the past year or so. I won’t go into the technical details here (Low Tech Magazine does a far better job explaining it than I can), but the thing to know is that dithering allows you to reduce the filesize of your images by reducing the amount of information it takes to render them.

Most applications focus on desaturating the image and inserting strategic whitespace so our eyes fill in the gaps, but I’ve taken a more… extreme approach (that is, when I use images at all, which I generally try not to). Because my website requires all images to be in the much-larger-than-PNG GIF format (see above), I insert significantly more whitespace to keep the filesizes super small. The result is terrible for screenshots, but looks fantastic on photos:

In case you want to accomplish the same thing on your own website (retro-or-not), here is the shell script I use to “degrade” all of my images using the ImageMagick command line interface:

#!/bin/bashpushd ./http/assets/posts/for f in *.jpg; do
    if [ -f "${f%.jpg}-degraded.gif" ]; then
    fi    echo "Converting $f to gif"    convert "${f}" -verbose -format GIF -interlace GIF -resize 640\> -colorspace gray -colors 4 -ordered-dither 8x8 -set filename:f "%[t]-degraded" "%[filename:f].gif"

No JavaScript

Just… No.

Validation, Baby

Okay, so we’ve built a website that any time traveler would be able to use. How the hell do we actually test it? While it’s tempting to collect retro hardware and do it natively (something I haven’t completely avoided), there are a handful of great resources out there that can make checking your website against old browsers incredible straightforward.


The most frequently used tool in my arsenal, is a website that allows you to emulate a number of different retro browsers (from NCSA Mosaic to Netscape Navigator) from directly within your own browser. This has allowed me to double-check my work and verify the workarounds above in realistic environments.

Utilu IE Collection

If you have an old Windows XP virtual machine laying around (or an old XP laptop, as I do), then the Utilu IE Collection is an incredibly valuable resource. On Windows XP, it allows you to install every version of Internet Explorer from 1 through 8, which is how I learned that my website actually works on IE 1–8, but also how I discovered that IE 1 and 2 _don’t send the host header.

Old Version

Finally, for all of the other browsers you may want to test (think Safari, Firefox, Netscape, and Chrome), is a favorite of mine. Personally, I pull down the oldest version of each browser they offer and install it on my test machine, allowing me to check my work on the “v1” releases of every browser out there.

Anything Else?

It’s important to remember that this is an experiment that I’m running in relative isolation. There aren’t exactly a ton of resources out there for providing value to aging systems beyond “recycle it” or “install Linux on it” (with the exception of my trusty How to Set Up and Maintain a Web Site book), so what I’ve learned has been a long series of trial and error.

If you happen to read this and have some of your own tips, please drop a comment. I’d love to hear from you!

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