MCE White image with transparency, add checkerboard

[drrobotnik]

The Default MCE editor has a white background. Your site may have a dark background, so if you upload a white image you can hardly see it in the editor. This could be fixed pretty easily with a css pseudo selector.

.mce-content-body img {
	background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAICAYAAADED76LAAAAJElEQVQYV2M8c+bMfwYkYGJiwojMZ6SDAmT7QGx0K1EcRBsFAIEqHZXwisJ7AAAAAElFTkSuQmCC);
}

[drrobotnik]

opacity checkerboard img background

[drrobotnik]

If base64 is an issue, you could swap it out for a simple graphic.

[KalenJohnson]

Doesn't this bloat the CSS somewhat?

[SergeyBiryukov]

This seems like something that should be handled by theme's editor-style.css file.

[drrobotnik]

Feels like a good enhancement for core to me.

[helen]

I don't think this is a good enhancement for core - it will cause the WYSIWYG display to not actually represent what the result will be. What happens if I'm putting a transparent PNG on a light background because I want it that way? I would see that background for no good reason. If your site has a dark background, the editor style should reflect that. If you'd rather compose on a light background (perfectly understandable), then the editor style can add the background.

[drrobotnik]

I'm fine with this.

Edited: Forget that last bit.