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HTML

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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                mixin image 
  div.c-page-header__image
    img(src="")
mixin title(keyword, text)
  h1.c-page-header__title.h-text--h1
   span.c-page-header__keyword= keyword
   span.c-page-header__title-text= text
mixin pretitle(text)
  a(href="#").c-page-header__pretitle.h-text--pretitle= text
mixin postTitle(text)
  span.c-page-header__posttitle.h-text--extra-large= text

mixin subnav(...items)
  nav.c-page-header__subnav.c-nav.c-nav--secondary.h-text--h6.h-text--black
    ul.c-nav__list
      each item in items
        li.c-nav__item
          a(href="#").c-nav__link= item

mixin quote(quote,cite,rating)
  div.c-page-header__quote.h-only-desktop


mixin infobar
  section.c-page-header__infobar
    span.o-container.o-page-grid
      time.c-page-header__date.h-text--h4.o-page-grid__item--sidebar
       //infobar
      a(href="#datesandtimes").o-page-grid__sidebar.c-page-header__action.o-button.o-button--outline.o-button--mega Choose dates &amp; Book
  
  
div.o-page-grid.o-container
  header.c-page-header.o-grid__item--full
    div.c-page-header__container.o-container
      +title('0 1 2 3 4 5 6 7 8 9 10 11 12')
      +pretitle('Generic')
      +postTitle('Resize to see the col constraint on title change')
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CSS 

              
                .c-page-header {
  //list all possible elements in page header
  @include template(title, pretitle, posttitle, datetime, quote, nav, search, subnav);
  &__container {
    display: grid;
   // The fr units add up to 12, so everything matches the page grid
    grid-template-columns: 7fr 1fr 4fr;
    //We will have three sections  of 7 cols, 1 col, and 4cols, equalling the 12 cols of page grid. If there are 3 template-columns there MUST be 3 named areas, per row, in the grid-template-areas, even if those are empty spaces (dot).
    grid-template-areas:
      "pretitle  . ."
      "title     . ."
      "posttitle . .";
    @include media(tablet) {
      grid-template-columns: 8fr 1fr 3fr; //5/6 on tablet no sidebar
    }
    @include media(phone) {
      grid-template-columns: 1fr;
      grid-template-areas: 
        "pretitle" "title" "posttitle"; 
    }
  }
}
!

JS
!
999px

Console