Root shakes Herath's hand to show the respect they and the cricket world have for the retiring spinner.
Jennings' second Test ton was neither pretty nor dynamic - and offered no clues about how he might reverse his struggles on seaming decks at home - but it was a study in concentration, the kind of effort England might have feared had headed for retirement with Alastair Cook.
With the game slipping away, Sri Lanka set up a defensive field.
"For a guy to come in on his debut and play an innings of that substance is exactly what we're after, for him to stand up and deliver", Root said.
Earlier, a disciplined piece of bowling from Sri Lanka saw them pick up three wickets for 73 runs in the opening session. If the pitches look drastically different we can adapt to that with a different XI and it's a very balanced XI.
But both fell after attacking shots, with Kaushal leg before trying to sweep Leach for 30 and Karunaratne caught and bowled by Ali - who took four wickets in both innings - for 26 as he skipped down the pitch for an attempted heave.
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Openers Dimuth Karunaratne (seven) and Kaushal Silva (eight) survived seven overs but Sri Lanka will need a near miracle to save the test.
In an illustrious career, the left-arm orthodox bowler took 433 Test wickets in matches, putting him eighth on the all-time list, which has Lankan compatriot Murali Muralitharan at the top with 800 scalps. Stokes shrugged off his early tentativeness to clobber three sixes in his 62 before Perara spun one past his bat to hit the top of the off-stump with a lovely delivery.
Having charged down the track to hit Leach for a boundary on the previous delivery, Mendis tried to repeat the feat and ended up holing out to Moeen.
Kusal Mendis added 46 runs with Mathews for the fourth wicket, but he too could not convert a good start into a big innings and fell for 45.
The final session began badly for the hosts.
Soon afterwards Angelo Mathews, dropped on 18 by James Anderson, went for 53, was caught by Jos Buttler at midwicket with Ali the wicker-taker again. The contributions of offspinner Akila Dananjaya came in for especial scrutiny - Dananjaya got only two wickets in the match, and conceded more than 4.7 runs per over.
England´s varied attack, with three quicks and three spinners, applied substantial pressure, with the slightly expensive Rashid the only minor disappointment.