A handful of U.S. jurisdictions that permit people to marry when they are not both physically present at the same place. But, even in those states, this is allowed only in very limited circumstances (mostly foreign military service deployments of one spouse). Also, even in those states, there must still be a proxy for the missing spouse at the marriage event to approve the marriage, who has been expressly authorized by the absent spouse to serve in this role. This is called "marriage by proxy""marriage by proxy" and is recognized in the number offollowing jurisdictions in certain circumstances.:
("Proxy marriage", Wikipedia)
Proxy marriages are also allowed under some interpretations of Islamic law.
For example, in the opening part of the manga series and anime adapted from it, in Tonikawa: Over The Moon For You, the sixteen year old-year-old wife signed the marriage form and had her guardian affix her seal consenting to her marriage in advance, the husband then signs the marriage form in his apartment, and they then go together to the marriage clerk at town hall to present the signed form together to the clerk so that they can be officially married (notably in the absence of the consenting guardian). While this is obviously a fictional story, this process is indeed permissible and valid in Japan, a civil law country, where the story is set.