Support retina image natively
If you have images with text on it (think about image button or logo), then you will want it looks sharp on retina device (iPhone 4s+ devices). With some help from Strikingly staff, I've been suggested upload high res image and use javascript to half size the image on load to make it looks good. It would be good to make some efforts to support retina image better in the system. Or at least, add image size field to image widget would be a workaround.