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.offsetwidth, .width, .width() Etc. Not Always Returning Properly On Auto-sized Element

I'm trying to resize a div based on the width of an image contained within it, but no JS method for grabbing the image's width seems to be working consistently.
).on('load', function() { var newWidth = $(".wp-post-image").first().width(); $(".wp-post-image").parent(".main_image").css("width", newWidth); });

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