Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
List of municipal commissioners for finance of Stockholm
Table title:
Mayors from 1920 till now
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=2 rowspan=1 > Name </th><th colspan=1 rowspan=1 > Term </th><th colspan=1 rowspan=1 > Political Party </th></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Carl Juhlin-Dannfelt </td><td colspan=1 rowspan=1 > 1920–1926 </td><td colspan=1 rowspan=1 > The Rightist Party </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Gustaf Söderlund </td><td colspan=1 rowspan=1 > 1926–1931 </td><td colspan=1 rowspan=1 > The Rightist Party </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Knut G. Ewerlöf </td><td colspan=1 rowspan=1 > 1931–1936 </td><td colspan=1 rowspan=1 > The Rightist Party </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Halvar Sundberg </td><td colspan=1 rowspan=1 > 1936–1940 </td><td colspan=1 rowspan=1 > The Rightist Party </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Zeth Höglund </td><td colspan=1 rowspan=1 > 1940–1950 </td><td colspan=1 rowspan=1 > Social Democrats </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > John Bergvall </td><td colspan=1 rowspan=1 > 1950–1954 </td><td colspan=1 rowspan=1 > Social Democrats </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Erik Huss </td><td colspan=1 rowspan=1 > 1954–1958 </td><td colspan=1 rowspan=1 > Liberal People's Party </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Hjalmar Mehr </td><td colspan=1 rowspan=1 > 1958–1966 </td><td colspan=1 rowspan=1 > Social Democrats </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Per-Olof Hansson </td><td colspan=1 rowspan=1 > 1966–1970 </td><td colspan=1 rowspan=1 > Liberal People's Party </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Albert Aronsson </td><td colspan=1 rowspan=1 > 1971–1973 </td><td colspan=1 rowspan=1 > Social Democrats </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > John-Olof Persson </td><td class="highlighted"  colspan=1 rowspan=1 > 1973–1976 </td><td class="highlighted"  colspan=1 rowspan=1 > Social Democrats </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Ulf Adelsohn </td><td colspan=1 rowspan=1 > 1976–1979 </td><td colspan=1 rowspan=1 > Moderate Party </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > John-Olof Persson </td><td class="highlighted"  colspan=1 rowspan=1 > 1979–1986 </td><td class="highlighted"  colspan=1 rowspan=1 > Social Democrats </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Sture Palmgren </td><td colspan=1 rowspan=1 > 1986–1988 </td><td colspan=1 rowspan=1 > Moderate Party </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Mats Hulth </td><td colspan=1 rowspan=1 > 1988–1991 </td><td colspan=1 rowspan=1 > Social Democrats </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Carl Cederschiöld </td><td colspan=1 rowspan=1 > 1991–1994 </td><td colspan=1 rowspan=1 > Moderate Party </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Mats Hulth </td><td colspan=1 rowspan=1 > 1994–1998 </td><td colspan=1 rowspan=1 > Social Democrats </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Carl Cederschiöld </td><td colspan=1 rowspan=1 > 1998–2002 </td><td colspan=1 rowspan=1 > Moderate Party </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Annika Billström </td><td colspan=1 rowspan=1 > 2002–2006 </td><td colspan=1 rowspan=1 > Social Democrats </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Kristina Axén Olin </td><td colspan=1 rowspan=1 > 2006–2008 </td><td colspan=1 rowspan=1 > Moderate Party </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Sten Nordin </td><td colspan=1 rowspan=1 > 2008–2014 </td><td colspan=1 rowspan=1 > Moderate Party </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Karin Wanngård </td><td colspan=1 rowspan=1 > 2014–2018 </td><td colspan=1 rowspan=1 > Social Democrats </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Anna König Jerlmyr </td><td colspan=1 rowspan=1 > 2018– </td><td colspan=1 rowspan=1 > Moderate Party </td></tr>
</table>
Question:
Who was a member of the Social Democratic Party and Mayor of Stockholm from 1973-1976 and from 1979-1986?
Answer:
John-Olof Persson was a member of the Social Democratic Party and Mayor of Stockholm from 1973-1976 and from 1979-1986.