Rust

html: expose some things, remove `output` capture name. #1251

Job	Run time
build_wasm (nightly)	45s
build_bin_spec (nightly)	26m 38s
build_wasm (beta)	47s
clippy_format	2m 56s
build_bin_spec (beta)	59s
build_wasm (stable)	47s
build_lib_test (nightly)	49s
build_bin_spec (stable)	1m 5s
build_wasm ($MSRV)	3m 14s
build_lib_test (beta)	1m 1s
build_bin_spec ($MSRV)	3m 23s
lockfile	56s
build_lib_test (stable)	1m 2s
build_lib_test ($MSRV)	3m 38s
no_features_build_test (nightly)	27s
no_features_build_test (beta)	27s
no_features_build_test (stable)	26s
no_features_build_test ($MSRV)	2m 47s
	52m 7s

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