The following page:

<iframe
	src="https://bandcamp.com/EmbeddedPlayer/size=small/track=52352246/"
	style="width:100%;">
</iframe>

crashes the web renderer with this:

VERIFICATION FAILED: m_has_value at /mnt/c/projects/ladybird/AK/Optional.h:213
/mnt/c/projects/ladybird/Build/ladybird/libexec/../lib/liblagom-ak.so.0(ak_verification_failed+0xef) [0x7fded41c535f]
/mnt/c/projects/ladybird/Build/ladybird/libexec/../lib/liblagom-web.so.0(+0x9a993a) [0x7fded824593a]
/mnt/c/projects/ladybird/Build/ladybird/libexec/../lib/liblagom-web.so.0 Web::Layout::FormattingContext::layout_absolutely_positioned_element(Web::Layout::Box const&, Web::Layout::AvailableSpace const&) 0x23e) [0x7fded824132e]
/mnt/c/projects/ladybird/Build/ladybird/libexec/../lib/liblagom-web.so.0 Web::Layout::BlockFormattingContext::parent_context_did_dimension_child_root_box() 0x21e) [0x7fded821f5ce]
/mnt/c/projects/ladybird/Build/ladybird/libexec/../lib/liblagom-web.so.0 Web::Layout::FormattingContext::layout_absolutely_positioned_element(Web::Layout::Box const&, Web::Layout::AvailableSpace const&) 0x3fc) [0x7fded82414ec]
/mnt/c/projects/ladybird/Build/ladybird/libexec/../lib/liblagom-web.so.0 Web::Layout::BlockFormattingContext::parent_context_did_dimension_child_root_box() 0x21e) [0x7fded821f5ce]
/mnt/c/projects/ladybird/Build/ladybird/libexec/../lib/liblagom-web.so.0 Web::Layout::FormattingContext::layout_absolutely_positioned_element(Web::Layout::Box const&, Web::Layout::AvailableSpace const&) 0x3fc) [0x7fded82414ec]
<cut>

From what I could test, it crashes when width, specified as either CSS or through the width attribute, is set to a value that's higher than some specific one (in my case, 369px is the limit, and anything above will crash). Other style attributes like height don't affect this.