TWelve Days of TiddlyWiki, TWelve Days of Osmosoft

I’m going to be moving on from Osmosoft soon. It’s been 18-odd months since joining and 3 years at BT. I’ve had a wonderful time here, worked alongside so much dedicated talent and energetic passion, and learned a ton about working according to the principles of open source, as well as new ways of working and thinking about things in a large enterprise. What I’m doing next is the subject of a subsequent post … this one’s about Osmosoft and TiddlyWiki and a new site I’ve set up for the occasion: 12 Days of TiddlyWiki.

I have to echo much of Jon Lister’s sentiments. I, too, am extremely grateful to Jeremy and JP for being brave enough to set up Osmosoft. It’s an organisation within BT that works predominately on the public internet and produces open source for everyone to use, but not in the mould of a “pure research outpost” or an “isolated skunkworks initative”. Osmosoft directly supports BT through the applications and components it produces, its involvement in open source policy, and its general involvement in BT’s software community, among other things. We just operate very differently to a conventional IT department. Oh, and we also make world class stock photos …

To celebrate my time here and to gently encourage myself to get a few things wrapped up, I decided to make a little microsite: 12 Days of TiddlyWiki. It will feature a new product for each of my final 12days at Osmosoft. And of course, it’s dogfooding: it’s powered by TiddlyWiki and if you peek under the RESTful hood, you’ll see it’s just another view into the main Osmosoft server, and could easily be mashed up however you please.

There’s one more benefit of Osmosoft working in an open source way to mention: Leaving is not leaving. And here I’ll echo another friend, Dion, who mentioned a similar effect when he moved on from the Bespin project … the code’s out there and I’m still able to remain part of the TiddlyWiki community. I had no idea how powerful TiddlyWiki was when I first joined. It’s a story that still needs to be told in full, but the bottom line for me is it scratches plenty of itches, and on that basis, I’ll still be using it and contributing back.

Unintended Consequences and the Inevitable “Why Would Anyone Want To Do This?”

I’m listening to this excellent BBC podcast on Unintended Consequences of Mathematics.

In his book The Mathematician’s Apology (1941), the Cambridge mathematician GH Hardy expressed his reverence for pure maths, and celebrated its uselessness in the real world. Yet one of the branches of pure mathematics in which Hardy excelled was number theory, and it was this field which played a major role in the work of his younger colleague, Alan Turing, as he worked first to crack Nazi codes at Bletchley Park and then on one of the first computers. Melvyn Bragg and guests explore the many surprising and completely unintended uses to which mathematical discoveries have been put. These include: The cubic equations which led, after 400 years, to the development of alternating current – and the electric chair. The centuries-old work on games of chance which eventually contributed to the birth of population statistics. The discovery of non-Euclidean geometry, which crucially provided an ‘off-the-shelf’ solution which helped Albert Einstein forge his theory of relativity. The 17th-century theorem which became the basis for credit card encryption.

The relevance to the topic of this blog should be clear.

Show me someone doing something cool or experimental and I’ll show you someone who sniffs, “Why would anyone want to do this?”. The answer may be because it was fun, because they wanted to see if it was possible, or because they wanted to learn something. But whatever their primary reason, one thing’s for sure: there will be unintended consequences. The examples above show it’s happened in mathematics, and we’ve seen the same thing happen time and again in web development.

The rich interactivity we see today wouldn’t have been possible if people hadn’t been willing to fool around with the not-so-always-obvious features of web browsers. Take cross-domain iframe messaging, for example. Not something people knew much about until a few years ago, when James Burke documented his experiments. A few years later, it’s a fundamental technology in OpenSocial (which means iGoogle, the Yahoo! homepage, among many other sites), Facebook’s official Javascript client, and evidently has much interest from elsewhere.

So next time you see some wit ask “Why would anyone ever need this?”, just stay schtoom, sit back, and wait six months.

Not Your Grandpa’s Framesets: Premasagar Rose shows us IFrame 2.0!

usual live blogging caveats – spelling errors, messy, etc etc

@premasagar is visiting the Osmoplex today (thanks @jayfresh for arranging it) and is taking us through his work on iframes, widgets, and sandboxing. I’ve realised we could perhaps be collaborating as my jquery-iframe plugin is so close to his. Different emphases, but much overlap.

GitHub is where you can see what he’s been working on. Basically, this guy is a guru on all things iFrame. In particular, all the quirks around squirting dynamic content into iFrames, as opposed to pointing them elesewhere using “src”.


“sqwidget is my tiddly”


In patternesque speak, the basic problem is:

Problem: You want to embed 3rd party content into another site.


  • You want the 3rd party content to have its own style
  • BUT it will inherit style from the parent page



Works great (in fact, I’m using it in my TiddlyWiki playground app, to be documented at some point, and is similarly used in Jon Lister’s TiddlyTemplating.

The problem is you sometimes want the widget to jump out of the iframe, e.g. a ligthboxed video. So …



Basically a CSS reset, but whereas CSS resets will only handle browser defaults, cleanSlate blats everything! This is exactly the kind of thing I was looking for when I was trying to cancel out tiddlywiki styling. In that case, I was flipping the entire page back and forth, so I could just cheat by removing stylesheets and re-add them. (Prem pointed out there’s a “disabled” attribute on style tags – true, so I should really use this instead, assuming it’s portable, which he thinks it is.)

Problems: – Difficult to maintain CleanSlate library, because new CSS stuff and browser quirks keep coming up – IE6 and IE7 don’t support “inherit”, so need CSS expression. – When using Javascript to interact with CSS style properties, e.g. slideDown(), these will override CleanSlate. The solution is to set the “style” attribute with !important, but it becomes an arms race! – Doesn’t solve iFrame security model


Inject (aka squirt, inject; summary) content into a fresh iframe.

The content comes from the widget site. The sqwidget library injects it. This resolves the tension with wanting independent CSS on the same page. If the sqwidget library is running on the host page, it could even (potentially) lock down capabilities, i.e. do Caja-style sanitisation.

Sqwidget also does templating, using Resig’s micro-templating. (That thing’s getting to be very popular; I’m using it myself in Scrumptious via the UnderScoreJS library after @fnd gave us a talk about them.)

Also, prem is playing around with the idea of a div, with custom (data-*) attribute pointing to the third-party URL. You could put inside it “now loading” and then the script tag will pick those things up and load them.

Various points: