Is it possible to apply styles to editable images divs so that each week those images can be swapped out and the styles remain consistent? For example: <div class="mktEditable" id="Main_image" style="padding-bottom:20px;">Main Image here</div> Also, can you use the same technique for text styling?
No its not possible to do so. Rather you can use another element inside that <div> and define any styling you want for image/ text in that element. Everytime you want to update the image or text, then it can be easily done without altering the style tags.
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