mixin h1-heading(level, inner = false)
    - let classes = ['o-heading', 'o-heading--' + level]
    h1(class=classes)&attributes(attributes)
        if inner
            span.o-heading__inner
                block
        else
            block

mixin h2-heading(level)
    - let classes = ['o-heading', 'o-heading--' + level]
    h2(class=classes)&attributes(attributes)
        block

mixin h3-heading(level)
    - let classes = ['o-heading', 'o-heading--' + level]
    h3(class=classes)&attributes(attributes)
        block

mixin h4-heading(level)
    - let classes = ['o-heading', 'o-heading--' + level]
    h4(class=classes)&attributes(attributes)
        block

mixin h5-heading(level)
    - let classes = ['o-heading', 'o-heading--' + level]
    h5(class=classes)&attributes(attributes)
        block

mixin h6-heading(level)
    - let classes = ['o-heading', 'o-heading--' + level]
    h6(class=classes)&attributes(attributes)
        block

mixin div-heading(level, inner = false)
    - let classes = ['o-heading', 'o-heading--' + level]
    div(class=classes)&attributes(attributes)
        if inner
            span.o-heading__inner
                block
        else
            block