iron-image.sizing="cover" expands the image to cover all of its
specified size.
sizing="contain" expands the image to fit within its
specified size.
--iron-image-width property to set the width of
the image wrapped by the iron-image.
--iron-image-height property to set the height of
the image wrapped by the iron-image.
preload attribute shows a placeholder element in front
of the image before it has loaded. Use the
--iron-image-placeholder CSS mixin to style it.
fade attribute, the placeholder element is
hidden with no transition when the image loads.
fade attribute, the placeholder element is
fades away when the image loads.
placeholder attribute to specify a background image
for the placeholder element.
fade attribute)
fade attribute)