[slowsmile]

@jhowell...Thanks for confirming that, which I suspected was the case.

But I'm still in the dark about how to properly format images in an epub for correct display across all KF7, KF8 and KFX devices. I made the point in my longer post above that images must be formatted for KF7 in absolute pixels whereas images formatted in KFX must be formatted as percentage of screen width AND must also comply with KFX's HDV image sizings. Dual formatting your images using media queries will certainly cover formatting for KF8 and KF7 devices but it does not properly cover KFX devices because HDV compliance also requires that you must use much larger images for KFX than the images required for KF8 or KF7.

So if you format and store all your smaller-sized images in your epub at real image size in pixels then this will enable proper displays across all KF7 devices. But such images may look degraded and lower quality across all KFX devices because all stored images will be formatted to a smaller size for KF7 which does not properly follow KFX's HDV image sizing compliance, which will not play well on KFX -- resulting in poor quality image displays across all KFX devices.

Similarly if you format all your epub images according to the HDV compliance(using larger images) for KFX and format your images using percentage of screen width then there will be no problems on KFX(or KF8) devices but, unfortunately, KF7 format will ignore the percentage styling completely -- so all you will ever get is lower quality images that will always be displayed at max screen width because all HDV sizings for images are so large -- usually much larger than screen width.

The gist of what I'm saying is that it seems to be impossible to implement an image width or size that is smaller than max screen width across all KFX, KF8 and KF7 devices for all reasons given. The only way I can see to accurately display these images across all devices seems to be to only use percentage styling with all images set to max screen width. That would probably work but, IMHO, that's a poor solution really because its your only option.

I've also assumed that if you upload a properly formatted Word doc direct to KDP then the aforementioned smaller images in the Word doc will only display properly on KFX devices. For older KF8 devices(without ET enabled) I'm also assuming that all your Word images will just display as mobi7 on KF8 devices -- where all your smaller images will, instead, be full page width and look awful -- because the older KF8 format(without ET) has gone AWOL. I'm still gob-smacked that Amazon Kindle has done this.