An alternative way of thinking about these extra slashes is to think in terms of elements.[5] An element takes one of two forms: either a start-tag and an end-tag (whose types must match):
<tag> . . . </tag>
or a single empty-element tag (complete with extra slash):
<tag/>
Note that there is exactly one slash per element.
An element can contain other elements (either matched pairs or
empty-element tags), possibly mixed up with flow text. Looking at
Example 1.2 this way, there is a single
<wml> element (as a matched pair
<wml>
</wml>),
containing a single <card> element (as a
matched pair <card>
</card>), containing a single
<p> element (also as a matched pair,
<p>
</p>), which in
turn contains a single <img> element (as the
empty-element tag <img/>).
It’s important to ensure the tags match properly. Mismatching tags such as:
<x>...<y>...</x>...</y>
is an error and will prevent the page from being displayed. This should have been written as:
<x>...<y>...</y>...</x>
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