Question: What sport do both the 2017 EFL League One play-off Final and the 2017–18 EFL Championship have in common?

Context paragraphs:
2017 EFL League Two play-off final: The 2017 EFL League Two play-off Final was a football match that was contested between Blackpool and Exeter City.  The match was played at Wembley Stadium on 28 May 2017.  Blackpool won the game 2-1 and were promoted to League One for the 2017-18 season.

EFL League Two play-offs: The English Football League Two play-offs are a series of play-off matches, contested by the teams finishing from 4th to 7th in the EFL League Two table to determine the fourth promotion place to the third tier of English football, League One.  The semi-finals are played over two legs, with 7th playing 4th and 6th playing 5th, with the return fixtures following.  The final is played at Wembley Stadium, although from 2001 to 2006 the final was played at the Millennium Stadium in Cardiff while Wembley was being rebuilt.  Due to a clash with the Champions League final, the 2011 play-off final was again in a new location, this time at Old Trafford.

2007 Football League One play-off Final: The 2007 Football League One play-off Final was a football match played at Wembley Stadium on 27 May 2007, at the end of the 2006–07 season.  It was the third League One play-off final since the Football League's 2004 rebranding, the 21st play-off final in all at the third level of English football, and the first of these matches to take place at the rebuilt Wembley.  The match determined the third and final team to gain promotion from League One to the Championship, and was contested by Blackpool, who had finished third during the league season, and Yeovil Town, who had finished fifth.  The teams reached the final by defeating Oldham Athletic and Nottingham Forest respectively in the two-legged semi-finals.  Robbie Williams and Keigan Parker scored the goals that gave Blackpool a 2–0 victory in the final.

2017–18 Huddersfield Town A.F.C. season: The 2017–18 season is Huddersfield Town's 109th year in existence and first season in the Premier League following promotion via the 2017 EFL Championship play-off Final.  The club will also compete in the FA Cup and EFL Cup.

2017–18 EFL Championship: The 2017–18 EFL Championship (referred to as the Sky Bet Championship for sponsorship reasons) is the second season of the EFL Championship under its current name, and the twenty-sixth season under its current league structure.

2017 EFL League One play-off Final: The 2017 EFL League One play-off Final was a football match contested between Bradford City and Millwall.  The match was played at Wembley Stadium on 20 May 2017 and was won 1–0 by Millwall, the only goal scored by Steve Morison in the 85th minute.  Millwall were promoted to the Championship for the 2017–18 season.  The match saw the first ever pitch invasion at the new Wembley Stadium.

2006 Football League One play-off Final: The 2006 Football League One play-off Final was a football match played at Millennium Stadium on 27 May 2006, at the end of the 2005–06 season.  It was the second League One play-off final since the Football League's 2004 rebranding, the 20th play-off final in all at the third level of English football, and the last of these matches to take place at the Millennium Stadium.  The match determined the third and final team to gain promotion from League One to the Championship, and was contested by Barnsley, who had finished fifth during the league season, and Swansea City, who had finished sixth.  The teams reached the final by defeating Huddersfield and Brentford respectively in the two-legged semi-finals.  Paul Hayes scored to give Barnsley the lead before Rory Fallon and Andy Robinson both scored to put Swansea in the lead.  Daniel Nardiello scored to take the game to extra time and a penalty shoot-out, which Barnsley won 4-3.

2017 EFL Championship play-off final: The 2017 EFL Championship play-off final was hosted on 29 May 2017 at Wembley Stadium, London.  The winner gained promotion to the 2017–18 Premier League season.  The top two teams of the 2016–17 EFL Championship season gained automatic promotion to the Premier League, whilst the teams placed between third and sixth place in the league table played two initial matches in a series of play-offs, and the top two teams of the play-offs play for the final place for the 2017–18 season in the Premier League.

2016–17 Exeter City F.C. season: The 2016–17 season was Exeter City's 115th year in existence and their fifth consecutive season in League Two.  Along with competing in League Two, the club also participated in the FA Cup, EFL Cup and EFL Trophy.  Exeter finished the season in 5th place, qualifying for the promotion play-offs.  In September, Exeter City broke their all-time record for consecutive home league losses by losing their first five home matches of the season.  Exeter City did not record their first league win at their home ground St James Park until mid-December, after 10 attempts.  A dramatic upturn in form saw the team rise from the bottom of the league table to a high of 4th.  From 31 December 2016 to 4 February 2017, Exeter won all seven of their fixtures, with David Wheeler scoring in each match.  With this feat, he equalled and then broke records set by Henry Poulter, Roderick Williams and Alan Beer.  Two other records were broken this season because no Exeter City team had ever won seven league games in a row (during the same season).  Exeter City also broke their record for most away wins in the league within one season, after their twelfth away triumph at Mansfield Town on 1 April.  This season was first in which City qualified for the promotion play-offs in League Two since their relegation from League One in 2012.  Exeter overcame Carlisle United to qualify for the play-off final against Blackpool at Wembley.  Blackpool beat Exeter 2–1 in the play-off final to earn promotion to the 2017–18 EFL League One.

EFL Trophy: The EFL Trophy (English Football League Trophy) is an annual English association football knockout competition open to the 48 clubs in EFL League One and EFL League Two, the third and fourth tiers of the English football league system and, since the 2016–17 season, 16 under-21 sides from Premier League and EFL Championship clubs.  It is the third most prestigious knockout trophy in English football after the FA Cup and EFL Cup (League Cup).

Supporting paragraphs: 2017 EFL League One play-off Final 2017–18 EFL Championship
Answer: football