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HTML

              
                h1.has-lines Example Title

h1.has-lines Fusce dapibus, tellus ac cursus commodo, tortor mauris

p.has-lines or

p.has-lines Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus donec sed odio dui.

p.has-lines
  button Action here


.description
  p Uses flexbox to avoid the need for nested elements, or using overflow hidden to mask super-long absolutely-positioned lines.

  p This technique works in all decent browsers, including IE11+. IE10 requires some legacy flexbox syntax and some extra tweaks but also displays as expected.

  p IE9 and earlier show partial lines (at the pseudo-element’s min-width), but still looks passable. If content wraps to multiple lines, the after element drops too. Depending on design, I'd use a  #[code .flexbox] Modernizr class to either hide the lines or would revert to an older method where absolute positioning, super-wide fixed-width lines, and overflow hidden are used.
              
            
!

CSS

              
                $lines--content-gutter = 10px
$lines--min-width = 40px

.has-lines
  display flex
  align-items center
  text-align center
  
  // IE10
  justify-content center

  &:before
  &:after
    content ''
    flex-grow 1
    height 1px
    background #ccc
    min-width $lines--min-width
    
    // IE10
    display inline-block
    
    // IE9
    vertical-align middle

  &:before
    margin-right $lines--content-gutter

  &:after
    margin-left $lines--content-gutter

body
  padding 30px

.description
  color #777
  max-width 500px
  margin 50px auto
              
            
!

JS

              
                
              
            
!
999px

Console