040000 tree 48abf0a1e8e2f1553041675e11802faf1531e54a	browser
040000 tree e000f239f3996834cc7bcf81bcc4920e11ad4231	custom_element
040000 tree ee11d98b4fed08ae4af93b66965d4e70afb69eff	html_import
040000 tree ab63489491258c43d9f96b91fd4b1c113dbe36cf	mutation_observer
040000 tree c556d00aef6d51241f671a7d40c5ecbbc39e0450	observatory
040000 tree 20dbdc4877693ab60b346e47aca15ff1284f30de	polymer
040000 tree e01c0f26585f7927a57969649b9beb77996b5dc9	shadow_dom
040000 tree e4a57ac3cf8b879c4ce869b0fbfcfd8974ef92f5	web_components