img loading initial value: eager
img loading value after setting to "invalid": eager
img loading value after setting to "lazy": lazy
img loading value after setting to null: eager
img loading value after setting to "LAZY": lazy
img loading value after setting to "": eager
img loading value after calling removeAttribute: eager
iframe loading initial value: eager
iframe loading value after setting to "invalid": eager
iframe loading value after setting to "lazy": lazy
iframe loading value after setting to null: eager
iframe loading value after setting to "LAZY": lazy
iframe loading value after setting to "": eager
iframe loading value after calling removeAttribute: eager
