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==Limitations==
===Label length===
Labels produced by <tt>|labelN=</tt>, where <tt>N</tt> is 1, 2, ..., can lead to poor layout of the resulting cladogram. (This does not apply to the text of leaves, i.e. text produced by <tt>|N=</tt>.) To avoid problems:
* labels should be kept as short as possible, ideally a single word
* any necessary spaces in labels should be represented as &amp;nbsp; not as actual spaces
* line breaks (i.e. <nowiki><br></nowiki>) should not be used.

===Browser differences===
[[File:Cladograms - browser variation.png|thumb|Browser variation: left – Internet Explorer, Firefox; right – Safari, Chrome, Opera]]
Cladograms are drawn by generating hidden tables. The horizontal and vertical lines making up the tree are actually the edges of table cells. The tables are then drawn by the browser or user agent using its internal algorithms. As these differ from browser to browser, the trees produced will not look the same on all browsers.

In particular, {{as of|2012|April|lc=yes}} there are two algorithms for laying out tables with empty cells, used by two groups of browsers. Browsers like Internet Explorer and Firefox use one algorithm, producing cladograms like the two on the left in the diagram. Browsers like Safari, Chrome and Opera use another algorithm, producing cladograms like the two on the right in the diagram.

No automated "fix" for these differences exists at present.

If there is a choice over the ordering of the terminal nodes (leaves) of the tree, cladograms look best in the second group of browsers if as much branching as possible is at the bottom of the cladogram. Typically this is produced by arranging the terminal nodes ''downwards'' on the page in order of their evolutionary divergence. Compare the bottom row of the diagram to the top row.

===Large cladograms===
There are limitations on the size and complexity of the cladograms which can be drawn:
* A maximum of 17 children is allowed per node. It may seem that this could easily be increased by editing the template, but see the next point.
* Cladograms can only be expanded up to a certain level of complexity because the MediaWiki software limits the resources available for template expansion. The cladogram at [[APG_III_system#Phylogeny]] has had to be broken into three parts, because the entire cladogram exhausts the allowed resources (in this case the allowed expansion depth). ''Any change to the template could result in large cladograms failing to display correctly.'' In general, don't exceed a depth of 19, i.e. don't nest one {{#ifeq:{{{1|}}}|cladex|cladex|clade}} template inside another more than 19 times.

===Inclusion in books===
There are many known bugs in rendering tables in the software which produces [[Help:Books|Wikipedia books]]; see the [//meta.wikimedia.org/wiki/Book_tool/Feedback book tool feedback page]. {{as of|2011|July|}} these result in the lines in cladograms not displaying in books.</includeonly><noinclude>
This is the common part of the documentation for the two templates {{tl|Clade}} and {{tl|Cladex}}.
Set the first parameter to "clade" or "cladex" to select which version is shown.
</noinclude>