I can now 
With this selector "div.name > strong > a", it is working:
- select all
<a> under a <strong> that is under a <div> of class "name"
library(splashr)
#> Warning: le package 'splashr' a été compilé avec la version R 3.4.4
sp <- splash("192.168.99.100")
page <- render_html(sp, url = "https://www.nhl.com/gamecenter/phi-vs-bos/1974/05/07/1973030311#game=1973030311,game_state=final")
library(rvest)
#> Le chargement a nécessité le package : xml2
page %>%
html_nodes("div.name > strong > a") %>%
html_attr("href")
#> [1] "https://www.nhl.com/player/wayne-cashman-8446002"
#> [2] "https://www.nhl.com/player/gregg-sheppard-8451335"
#> [3] "https://www.nhl.com/player/orest-kindrachuk-8448495"
#> [4] "https://www.nhl.com/player/bobby-clarke-8446098"
#> [5] "https://www.nhl.com/player/bobby-orr-8450070"
Created on 2018-08-10 by the reprex package (v0.2.0).