Alberta lawmakers have passed a bill mandating no-protest zones around abortion clinics after a vote in which the Opposition United Conservatives once again walked out of the chamber in protest.

Alberta's abortion clinic bill moved closer to passage Tuesday following a legislature debate that saw Opposition United Conservatives walk out of the chamber en masse five more times to avoid casting a vote.

The NDP government made more changes to its abortion clinic bill Wednesday while the Opposition United Conservatives continued to register their displeasure by walking out en masse during votes.

UCP MLAs sat stonefaced and silent Thursday, looking at phones and tablets as opponents accused them of misogyny and political cowardice over the government's proposed abortion clinic buffer zone bill.

Alberta United Conservative Leader Jason Kenney says proposed legislation creating safe zones around abortion clinics is political game-playing by the NDP government.

Alberta has introduced legislation to keep protesters at least 50 metres away from abortion clinics, and to make it illegal for demonstrators to video, record audio or take pictures of people entering or leaving the building.

The Supreme Court has struck down Texas' widely replicated regulation of abortion clinics in the court's biggest abortion case in nearly a quarter century.

A third of the abortion clinics in Texas can no longer perform the procedure starting Friday after a federal appeals court allowed most of the state's new abortion restrictions to take effect.

The only abortion clinic in a 300-mile swath of West Texas can resume taking appointments Tuesday, after a federal judge struck down new restrictions that would have effectively shuttered it.