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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Assignee:</th> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Fix Versions:</th> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Priority:</th> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Reporter:</th> 
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                                                    <td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">Java 9 implements <a href="http://openjdk.java.net/jeps/224" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">JEP 224</a> ("HTML5 Javadoc"). This introduces new <tt>-html4</tt> and <tt>-html5</tt> options for <tt>javadoc</tt>.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">In Java 10, a warning is introduced:</p> 
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                                                                <pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
You have not specified the version of HTML to use.
The <span class="code-keyword" style="color: #000091">default</span> is currently HTML 4.01, but <span class="code-keyword" style="color: #000091">this</span> will change to HTML5
in a <span class="code-keyword" style="color: #000091">future</span> release. To suppress <span class="code-keyword" style="color: #000091">this</span> warning, please specify the
version of HTML used in your documentation comments and to be
generated by <span class="code-keyword" style="color: #000091">this</span> doclet, using the -html4 or -html5 options.
</pre> 
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                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">We should determine which version of HTML we want to standardise on. Clearly the intention is to push us towards HTML5, which would have the advantages of not going against the grain as well as working with a better-defined specification.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The downside of going down the HTML5 path is that it may require us to make some additional changes to our existing document comments to make them valid HTML5 (in addition to any changes already required to make them valid HTML 4.01, which given that historically the javadoc parser has not flagged up most HTML issues may well be a non-empty set).</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Once we have decided which way we want to go, we should set the appropriate option on the <tt>maven-javadoc-plugin</tt> in Java 9 and later.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">There's no indication yet of which Java version will change the default to HTML5. In particular, we don't know whether it will be done in Java 11 as the EAs have just started coming out.</p> </td> 
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