Stabilize ClipboardEvent #1663

Job	Run time
build_benchmarks	47s
Check	50s
build_examples	46s
build_nightly	50s
Verify that web-sys is compiled correctly	44s
Clippy	48s
dist_linux_aarch64_gnu	49s
dist_linux_x86_64_musl	48s
dist_macos_aarch64	51s
dist_macos_x86_64	48s
dist_windows	42s
doc_api	46s
doc_book	11s
Rustfmt	11s
Build and test the deno example	47s
Run native tests	38s
Run js-sys crate tests	47s
Run wasm-bindgen crate tests with multithreading enabled	46s
Test TypeScript output of wasm-bindgen	47s
Run UI compile-fail tests	1s
Run wasm-bindgen crate tests (unix)	28s
Run web-sys crate tests	25s
Run wasm-bindgen-webidl crate tests	46s
test_examples	1s
deploy	1s
	15m 18s

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