Oh no, H3 before H2

Yikes! H2 before H1

Ok so here is a link that actually goes somewhere! Now this link doesn't actually go anywhere. Oh no! This is a link attribute that also has no destination. Not even an href.

Header H1 all the way down here

Missing alt

H2 After the H1 but still incorrect because there is an H3 above it

This H4 is OK. Image below has alt attribute, even though its empty.

Empty but existing alt. Has size attributes. Alternative text Filled alt, no size attributes

Here's a link out that may be insecure.