(Reuters) - Here is a timeline of developments since China imposed national security legislation in Hong Kong this year, making anything Beijing regards as subversion, secession, terrorism or colluding with foreign forces punishable by up to life in prison.June 30: Beijing unveils details of the national security law, which takes effect just before midnight on the eve of the anniversary of its handover from British to Chinese rule on July 1. July 1: Police arrest more than 300 people as protesters take to streets. Ten are arrested under the new national security law. Britain promises to grant those in Hong Kong with British National Overseas (BNO) passports five years of limited stay to work or study as a pathway to citizenship. July 2: Government says protest slogan “Liberate Hong Kong, Revolution of our times” could constitute subversion. July 3: United Nations says it is “alarmed” at arrests in Hong Kong under new law. July 5: Hong Kong’s Education Bureau urges schools to review textbooks to make sure they do not violate security law. First person charged under the new law is denied bail.