Double-stitching code to fight eReader incompatibilityPosted by Guido ·
I honestly had not expected how much work it would be, putting together my book Zen of eBook Formatting. After all, I had the blog tutorial to build upon, and yet, it took me many months to flesh out the final book, add in all the little details and additions, and tweak it to make sure it is as accurate as I can make it. Part of it had to do with the fact that eReaders have turned into a sea of incompatibility.
While the original “Take Pride in your eBook Formatting” tutorial is still every bit as relevant and applicable today as it was when I first published it a few years back, as soon as you want to go beyond the most basic formatting features, you get caught up very quickly in the morass of device limitations and quirks.
With each new device generation new problems are being introduced, and considering that we are now looking at fifth or sixth generation devices, one can quickly get lost in the maze of dos and donts of eBook formatting.
I am not pointing fingers here because every manufacturer contributes to the problem. Apple with its incompatible ePub implementations in iBooks for one, Amazon for other limitations and countless firmware bugs, Barnes&Noble for a different set of firmware bugs. Each of them making it harder for eBook formatters to navigate these waters and create reliable products.
Switching a font face, for example should be a completely trivial thing. According to the HTML standards which underly both the MOBI and EPUB format, you should be able to switch fonts anytime on a block level. Sadly, this is not true in the world of eBooks.
Typically a code snippet like this should work fine on any device, assuming we have a span style called “newfont” that sets a different font family.
<p>Let’s <span class="newfont">switch the font</span></p>
Sadly, all of Apple’s iBooks devices and software do not follow this standard. Not even a snippet like the following one works.
<p class="newfont">Let’s switch the font</p>
iBooks does not recognize font family settings in <p> and <span> elements, which is completely inconsistent with HTML standards. It is not a mere oversight, however, because Apple has been dragging this problem through all iterations of iBooks, since its inception years ago. One can only wonder what Apple’s software engineers are thinking.
I found that oftentimes I have to double-stitch solutions, nesting different solutions, so that if one doesn’t work there is always a fallback. The work-around to fix this particular problem is to use another block-level tag in order to pass the information to iBooks.
<p>Let’s <span class="newfont"><cite class="newfont">switch the font</cite></span></p>
While this is not the most elegant solution, and purists will scream out at the misuse of the <cite> tag here, the reality of things is that as eBook formatters we currently cannot afford to be purists. We need formatting challenges solved and in this case <cite> addresses a very specific problem. If Apple would stick to the standards in the first place, hacks like this would not be needed.
I found that the same kind of double-stitching is sadly needed if you want to strike out text, as in draw a line through it. It is not a very commonly used text feature, but if you need it, it is imperative that it shows up correctly.
Instinctively you would use the <strike> tag, which has been part of the HTML vocabulary since its inception. <strike>, however, has been discontinued with the HTML5 standard, and as a result there are now eReaders that no longer support it. They require the <del> tag instead, which, quite by coincidence, is not supported by some older devices, of course.
As in many cases, double-stitching the solution is the way to go for me and whenever I have to strike out text, it will look like this.
<p>This is how you <strike><del>strike out</del></strike> text.</p>
Once again, not the most elegant solution, but as you format eBooks, you will have to get used to seeing things such as this more and more often. As I said, with every new generation of eBook devices, the number of these types of inconsistencies will grow and the need to find and apply band-aid solutions will sadly grow with it.
If you want to find out more about basic and advanced eBook formatting techniques, make sure to check out my new book Zen of eBook Formatting, which details all the necessary steps to create professional-grade eBooks.