Add support to generate screenshots for documentation in specs #3981
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Uses `gem "capybara-screenshot"; branch from "el-cms/capybara-screenshot#custom-prefixes" (ahead of upstream with support for new options. Sadly, not yet merged upstream)
Adds a spec helper that injects and executes JS in the current page (
spec/support/screenshot_helpers.rb
).CSP are disabled in test env (commit
---FIXME
); let me know if you want to do this another way.