CSS :first-letter Not Working


Answer :

::first-letter does not work on inline elements such as a span. ::first-letter works on block elements such as a paragraph, table caption, table cell, list item, or those with their display property set to inline-block.


Therefore it's better to apply ::first-letter to a p instead of a span.


p::first-letter {font-size: 500px;}

or if you want a ::first-letter selector in a span then write it like this:


p b span::first-letter {font-size: 500px !important;}
span {display:block}

MDN provides the rationale for this non-obvious behaviour:



The ::first-letter CSS pseudo-element selects the first letter of the first line of a block, if it is not preceded by any other content (such as images or inline tables) on its line.


...


A first line has only meaning in a block-container box, therefore the ::first-letter pseudo-element has only an effect on elements with a display value of block, inline-block, table-cell, list-item or table-caption. In all other cases, ::first-letter has no effect.



Another odd case(apart from not working on inline items) is if you use :before the :first-letter will apply to the before not the actual first letter see codepen


Examples



  • http://jsfiddle.net/sandeep/KvGr2/9/

  • http://krijnhoetmer.nl/stuff/css/first-letter-inline-block/


References


https://developer.mozilla.org/en-US/docs/Web/CSS/::first-letter
http://reference.sitepoint.com/css/pseudoelement-firstletter



You can get the intended behavior by setting the span's display property to inline-block:





.heading span {
  display: inline-block;
}

.heading span:first-letter {
  color: red;
}

<div class="heading">
  <span>An</span>
  <span>Interesting</span>
  <span>Heading</span>
</div>





This is because :first-letter only operates on block / inline-block elements. SPAN is an inline element.



Taken from http://reference.sitepoint.com/css/pseudoelement-firstletter:




The :first-letter pseudo-element is mainly used for creating common
typographical effects like drop caps. This pseudo-element represents
the first character of the first formatted line of text in a
block-level element, an inline block, a table caption, a table cell,
or a list item.




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