Mangara Mangara - 1 year ago 69
CSS Question

Why is leading whitespace in a q element treated differently from other inline elements?

It seems that leading whitespace inside a

element is always preserved (albeit normalized to a single space), while this isn't the case for most inline elements. For example, the following code (jsFiddle):

<br> a <q>test</q> b <a href=#>test</a> c
<br> a <q> test</q> b <a href=#> test</a> c
<br> a <q>test </q> b <a href=#>test </a> c
<br> a <q> test </q> b <a href=#> test </a> c

Renders like this in all modern browsers I've tested (Chrome, FF, and Edge):

inconsistent spacing around q element

In the second and fourth line, the
is rendered with initial whitespace, while the
is not. Why is this?

EDIT: Adding the following CSS to the fiddle above:

a::before, a::after {
content: '"';

Makes them render identically. So it seems to have something to do with the CSS

Answer Source

According to Chrome's docs on default styles for HTML elements, the default style for the <q> element (quote) is:

q::before {
    content: open-quote;

q::after {
    content: close-quote;

As you noticed, if you apply the same style to the <a> element (anchor), you get the same results:

The key to understand this lies on the explanation of what are ::before and ::after. According to MDN, they create a pseudo-element that is the first (for ::before) or last (for ::after) child of the element matched. So you can imagine that an inline element with a quote inside was added as the first child of each <q>.

For example:

<br> a <span><span>"</span>    b</span>

Shows one space before b, while:

<br> a <span>    b</span>

Does not show the space before b.

You can see it in action here:

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