: Re: Which major eBook reading applications support JavaScript? I've been trying to find an eBook reader for Windows that fully supports EPUB3 (i.e. allows JavaScript) but I've had no such luck. So

@Melissa

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It's unlikley that companies who make an ereader app will support Javascript as it makes a potential security hole and the companies don't want the liability.

Javascript might take more extra time to implement, especially with different or custom operating systems on hardware ereaders. The cost may not be worth the effort.
Any new features could possibly introduce more liability than the company wants.
The ereader company may not have the personnel with skills to implement JS on a hardware ereader.
Many ereaders (hardware and software) use Adobe Digital Editions and ADE itself may not support JS at all. Paying a licensing fee for each unit that uses ADE may be simpler and cheaper than hiring a program who may or may not have the skills to get the job done.
Perhaps the ereader CPU is not fast enough to support all JS functions so JS may slow down the functions on the page the user sees thus resulting in consumer complaints. Plus e-ink does not refresh very fast either.

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