VANCOUVER, British Columbia — It’s the kind of performance that makes you forget that the Islanders are playing without nearly a third of their regular roster, the kind that makes you think maybe there’s something lasting here.

The Islanders entered building a playoff team and they possessed the puck, tilting the ice by playing a hard game under the hashes and establishing a forecheck that Edmonton had missed two nights before.

They beat the Canucks 5-2, a final score that, if anything, understated their performance in the same way that the 4-3 overtime loss to the Oilers on Tuesday night overstated it.

“I think we built our game for a night like this where we put everything together and stuck to a lot of things,” Anders Lee said. “Whether it’s the power play, stuff like that. All facets of the game were important for us tonight, and I think that’s why we played a really solid 60 minutes.

In doing so, the Islanders extended a burgeoning point streak to five games with wins in three of them, all without Mat Barzal, Anthony Duclair, Alexander Romanov, Adam Pelech or Mike Reilly. Over a six-game stretch without this quintet in which the stated goal was to keep their heads above water, the Islanders are 3-1-2 for a .750 points percentage.

Things have rarely looked better than Thursday, and if the NHL counted all losses equally, it would be .500. But to these statements, the retorts should be: “Who cares? and “They don’t.”

And if the Islanders can play like that consistently, then you can still throw all that away.

“I like to be half full (more) than half empty in my glass,” said coach Patrick Roy before specifying that yes, it is a glass of water. “But regardless, my point is this: we are very confident right now.”

Back-to-back goals from Scott Mayfield and Pierre Engvall early in the second period broke a 1-1 tie, with Mayfield’s point shot deflecting off a Vancouver stick and leaving Kevin Lankinen out of position just 14 seconds later the start of the period.

At 2:40, Engvall, playing his best game since returning from AHL exile, drove to the net and put down Simon Holmstrom’s rebound.

The game was 3-1 heading into the third period, even though the Islanders quadrupled Vancouver’s shots (24-6), prime territory for the kind of collapse that became a blue-and-orange pattern .

Indeed, a boost came for the Canucks, who finally put pressure on the Islanders and forced Semyon Varlamov to act in the third period.

But Varlamov, who didn’t have much to do for most of the game, looked anything but cold and finished the night with 24 saves.

Bo Horvat, playing his second game in Vancouver, put the nail in the proverbial coffin at 11:42 of the third, passing through the neutral zone and feeding Lee in front of the net – an assist that surely meant something to the former captain of the Canucks.

Noah Dobson added an empty net to make it 5-1 before Tyler Myers added a consolation goal for Vancouver.

“I feel like we did a really good job all night,” Ryan Pulock told the Post. “We did a good job of possessing the puck down low, our forwards did a great job of guarding it and moving the puck, and I thought maybe they had a few shifts where they were in our zone for a while, but I thought we did a good job keeping him out and muscling him in when we needed to.

From the start, the Islanders had played like a team looking to prove something after a sloppy performance two nights prior.

The question was whether they could keep it up for the full 60 minutes.

The answer was yes and more.

The answer was that the Islanders had just played their best game of the season thus far.

“Everyone played so well, it’s hard for me to single out anyone because everyone played so well,” Roy said. “Defensively, offensively, I thought we were on the puck, sharp, good forecheck, good (offensive zone). Defensively, we defended pretty well.

If they can continue, then watch out.