Problem : margins must be given to all page templates.

With the following code, the margins disappear from the right pages.

@page{
  size: 140mm 205mm;
  margin: 12mm 12mm;
}

@page:right {
  @top-left{
    ...
  }
}

The problem is solved by adding the size of the margins in the right page, like this :

@page{
  size: 140mm 205mm;
  margin: 12mm 12mm;
}

@page:right {
  margin: 12mm 12mm;
  @top-left{
    ...
  }
}

The correct version is that if the margins are declared only in @page, they also apply on @page:right that are declared without margins. It's the same for the other page selector (@page:left, @page:first, @page:nth(x))

The rule is that pages with selector has priority on @page, but properties of @page remains if it is not declared in pages with selectors.

Same problem with named pages.

With the following code, the margins disappear from the named pages "chapter".

@page{
  size: 140mm 205mm;
  margin: 12mm 12mm;
}

section {
  page: chapter
}

@page chapter {
  @top-center{
    ...
  }
}

The correct version is that if the margins are declared only in @page, @page:right and @page:left , they also apply on @page:chapter that are declared without margins. The left pages of chapter pages has the same margins as @page:left and the right pages of chapter pages has the same margins as @page:right