anchor.diff:            You will not be surprised, that BEM is abbreviation of the key elements of the methodology — Block, Element and Modifier.
   
       .grid__row
  -      .grid__cell-sm_size_2
  -      .grid__cell-sm_size_3.grid__cell_left-border
  +      .grid__cell-lg_size_2
  +      .grid__cell-lg_size_3.grid__cell_left-border
           .heading.heading_level_1.heading_block Block
           .raw-text
             :markdown
  
positive.code:             __Examples__
  
              `header`, `container`, `menu`, `checkbox`, `input`
        .grid__cell-sm_size_3.grid__cell_left-border
          .heading.heading_level_1.heading_element Element
          .raw-text
            :markdown
  
negative.code:             __Examples__
  
              `menu item`, `list item`, `checkbox caption`, `header title`
        .grid__cell-lg_size_3.grid__cell_left-border
          .heading.heading_level_1.heading_modifier Modifier
          .raw-text
            :markdown
  