(tl;dr - yes. However Polymer 2.0 is not and is an easy upgrade.) I am trying to migrate an old front-end code base away from polymer 1.11.3 (webcomponentsjs 0.
rightnow-crm
inflate
scatterpie
osx-tiger
hypertalk
kotlin-dokka
ata
roomplan
mopub
vxlan
laravel-helper
rpa
swiper
mips64
micronaut
urlconnection
oidc-client-js
rhino
bodypix
alter-column
litmus
runtime
near-api-js
acts-as-audited
character-encoding
openmq
java-text-blocks
python-cmath
linqkit
structured-concurrency