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content/glyph/book/text_editing/attribute_intro.html

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						<h2>Macro attributes</h2>
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							<div class="navigation"><a href="/glyph/book/text_editing/macro_intro.html">Introducing Glyph Macros &larr;</a><a href="/glyph/book/index.html">Contents</a><a href="/glyph/book/text_editing/esc_quot.html">&rarr; Escaping and Quoting</a></div>
								<p>Although a macro can take any number of parameters, they are often no more than two or three, for readibility reasons: parameters have no name, but their position within a macro is significant.</p>
<p>If you have something like this:</p>

	<pre class="lazy"><span class="line-numbers">   1 </span> custom_image[test.png|50%|50%|Test Image]
</pre>
	<p>it may still be easy enough to understand what each parameter is used for, but:</p>
<ul>
	<li>you can easily forget that the third parameter is the image width</li>
	<li>if you don&#8217;t want to resize the image, you still have to pass <em>empty parameters</em> to the macro, like this: <code>custom_image[test2.png|||Test Image]</code></li>
</ul>
<p>To avoid these situations, some macros which would normally take three or four parameters take optional attributes instead, so you can write:</p>
	<pre class="lazy"><span class="line-numbers">   1 </span> image[test.png
<span class="line-numbers">   2 </span>   @width[50%]
<span class="line-numbers">   3 </span>   @alt[Test Image]
<span class="line-numbers">   4 </span>   @height[50%]
<span class="line-numbers">   5 </span> ]
</pre>
	<p>More verbose, of course, but definitely more readable. In this way, if you won't want to scale an image, you can safely omit the <code>@width</code> and <code>@height</code> attributes.</p>
	<div class="note">
<span class="note-title">Note</span>Like parameters, attributes can contain other macros, too.

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