Apple TV's Coda, about a teenager who is the only hearing member of a deaf family, has become the first streaming film to win best picture at the Oscars.

Once considered the underdog, Coda beat the presumed frontrunner, the Netflix western The Power of the Dog.

Sir Kenneth Branagh and Riz Ahmed were among the British winners on Sunday.

Jessica Chastain won best actress, but the ceremony was overshadowed when best actor winner Will Smith hit Chris Rock over a joke about his wife, Jada.

The King Richard star later used his emotional acceptance speech to apologise to the Academy and his fellow nominees.

That incident shocked the attendees and millions of watching viewers, and cast a shadow over the rest of the ceremony.

The best picture win for Coda - which stands for Children of Deaf Adults - was a victory for a low-budget, independent film that has been praised for its representation of a deaf family, and for its casting of deaf actors.

They included Marlee Matlin, who became the first deaf Oscar winner 35 years ago, and Troy Kotsur, who became the second on Sunday when he won best supporting actor.

Delivering his speech via an interpreter, Kotsur dedicated his Oscar to "the deaf community, the Coda community and the disabled community", adding: "This is our moment."

The film's 17-year-old daughter is played by British actress Emilia Jones, the daughter of Welsh singer and TV presenter Aled Jones.

"I can't believe it," Emilia Jones told BBC News. "I honestly can't. When they called Coda out, we all just couldn't believe it. You know, we're the little underdog independent movie that kind of did it. And I'm just so grateful to everybody that has watched the movie, loved the movie and supported it. I'm on cloud nine."

With Coda, Apple thwarted Netflix's quest to become the first streaming service to win the prestigious best picture prize.

The Power of the Dog ended up winning one award from its 12 nominations - best director for Jane Campion. The New Zealand film-maker became just the third woman to win best director in the 94-year history of the Academy Awards.

She is also the second in a row, following Nomadland's Chloe Zhao last year.

Sci-fi epic Dune won the most awards overall with six, including most of the technical categories, while Chastain won her first Oscar for playing televangelist Tammy Faye Bakker in The Eyes of Tammy Faye.

Ariana DeBose won best supporting actress for playing Anita in West Side Story, 60 years after Rita Moreno won the same award for playing the same role in the musical's first film adaptation.

She described Moreno, 90, who was in the audience, as a "divine inspiration", adding: "I'm so grateful your Anita paved the way for tonnes of Anitas like me."

DeBose described herself as an "openly queer woman of colour, an Afro-Latina who found her strength in life through art and that's what I believe we're here to celebrate".