1.5.0 (2021-03-06)

lang placed on head instead of html (61f9965)
add lang to html (0c3a266)
add alt text to source image (39aa03f)
add description meta (b60613d)
add opengraph metadata (2eaf350)
add robots meta (872b2e8)
add structured metadata (950ee8e)
add viewport meta (52e1ec6)
allow buttons to wrap in modal nav (47e7b59)
better header style on mobile (96ec723)
hide source image when no source set (ac958fe)
include dialog-polyfill for non-chrome (7589fe2)
only close modal if it has focus (e166f43)
render modals into body (ba3a309)
update preact (ed372ba)
use native dialog element (7fcc48e)

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