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<h1 id="quality-assurance">Quality Assurance<a class="headerlink" href="#quality-assurance" title="Permanent link">&para;</a></h1>
<h2 id="overview">Overview<a class="headerlink" href="#overview" title="Permanent link">&para;</a></h2>
<p>Browsertrix Crawler can analyze an existing crawl to compare what the browser encountered on a website during crawling against the replay of the crawl WACZ. The WACZ produced by this analysis run includes additional comparison data (stored as WARC <code>resource</code> records) for the pages found during crawling against their replay in ReplayWeb.page. This works along several dimensions, including screenshot, extracted text, and page resource comparisons.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>QA features described on this page are available in Browsertrix Crawler releases 1.1.0 and later.</p>
</div>
<h2 id="getting-started">Getting started<a class="headerlink" href="#getting-started" title="Permanent link">&para;</a></h2>
<p>To be able to run QA on a crawl, you must first have an existing crawl, for example:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>docker<span class="w"> </span>run<span class="w"> </span>-v<span class="w"> </span><span class="nv">$PWD</span>/crawls:/crawls/<span class="w"> </span>-it<span class="w"> </span>webrecorder/browsertrix-crawler<span class="w"> </span>crawl<span class="w"> </span>--url<span class="w"> </span>https://webrecorder.net/<span class="w"> </span>--collection<span class="w"> </span>example-crawl<span class="w"> </span>--text<span class="w"> </span>to-warc<span class="w"> </span>--screenshot<span class="w"> </span>view<span class="w"> </span>--generateWACZ
</code></pre></div>
<p>Note that this crawl must be run with <code>--generateWACZ</code> flag as QA requires a WACZ to work with, and also ideally the <code>--text to-warc</code> and <code>--screenshot view</code> flags as well (see below for more details on comparison dimensions).</p>
<p>To analyze this crawl, call Browsertrix Crawler with the <code>qa</code> entrypoint, passing the original crawl WACZ as the <code>qaSource</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>docker<span class="w"> </span>run<span class="w"> </span>-v<span class="w"> </span><span class="nv">$PWD</span>/crawls/:/crawls/<span class="w"> </span>-it<span class="w"> </span>webrecorder/browsertrix-crawler<span class="w"> </span>qa<span class="w"> </span>--qaSource<span class="w"> </span>/crawls/collections/example-crawl/example-crawl.wacz<span class="w"> </span>--collection<span class="w"> </span>example-qa<span class="w"> </span>--generateWACZ
</code></pre></div>
<p>The <code>qaSource</code> can be:
- A local WACZ file path or a URL
- A single WACZ or a JSON file containing a list of WACZ files in the <code>resources</code> json (Multi-WACZ)</p>
<p>This assumes an existing crawl that was created in the <code>example-crawl</code> collection.</p>
<p>A new WACZ for the analysis run will be created in the resulting <code>example-qa</code> collection.</p>
<p>By default, the analysis crawl will visit all of the pages (as read from the source WACZ file(s)), however pages can further be limited by adding <code>--include</code> and <code>--exclude</code> regexes. The <code>--limit</code> flag will also limit how many pages are tested.</p>
<p>The analysis crawl will skip over any non-HTML pages such as PDFs which can be relied upon to be bit-for-bit identical as long as the resource was fully fetched.</p>
<h2 id="comparison-dimensions">Comparison Dimensions<a class="headerlink" href="#comparison-dimensions" title="Permanent link">&para;</a></h2>
<h3 id="screenshot-match">Screenshot Match<a class="headerlink" href="#screenshot-match" title="Permanent link">&para;</a></h3>
<p>One way to compare crawl and replay is to compare the screenshots of a page while it is being crawled with when it is being replayed. The initial viewport screenshots of each page from the crawl and replay are compared on the basis of pixel value similarity. This results in a score between 0 and 1.0 representing the percentage match between the crawl and replay screenshots for each page. The screenshots are stored in <code>urn:view:&lt;url&gt;</code> WARC resource records.</p>
<p>To enable comparison on this dimension, the crawl must be run with at least the <code>--screenshot view</code> option. (Additional screenshot options can be added as well).</p>
<h3 id="text-match">Text Match<a class="headerlink" href="#text-match" title="Permanent link">&para;</a></h3>
<p>Another way to compare the crawl and replay results is to use the text extracted from the HTML. This is done by comparing the extracted text from crawl and replay on the basis of <a href="https://en.wikipedia.org/wiki/Levenshtein_distance">Levenshtein distance</a>. This results in a score between 0 and 1.0 representing the percentage match between the crawl and replay text for each page. The extracted text is stored in <code>urn:text:&lt;url&gt;</code> WARC resource records.</p>
<p>To enable comparison on this dimension, the original crawl must be run with at least the <code>--text to-warc</code> option. (Additional text options can be added as well)</p>
<h3 id="resources-and-page-info">Resources and Page Info<a class="headerlink" href="#resources-and-page-info" title="Permanent link">&para;</a></h3>
<p>The <code>pageinfo</code> records produced by the crawl and analysis runs include a JSON document containing information about the resources loaded on each page, such as CSS stylesheets, JavaScript scripts, fonts, images, and videos. The URL, status code, MIME type, and resource type of each resource is saved in the <code>pageinfo</code> record for each page.</p>
<p>Since <code>pageinfo</code> records are produced for all crawls, this data is always available.</p>
<h3 id="comparison-data">Comparison Data<a class="headerlink" href="#comparison-data" title="Permanent link">&para;</a></h3>
<p>Comparison data is also added to the QA crawl's <code>pageinfo</code> records. The comparison data may look as follows:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="nt">&quot;comparison&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="w"> </span><span class="nt">&quot;screenshotMatch&quot;</span><span class="p">:</span><span class="w"> </span><span class="mf">0.95</span><span class="p">,</span>
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w"> </span><span class="nt">&quot;textMatch&quot;</span><span class="p">:</span><span class="w"> </span><span class="mf">0.9</span><span class="p">,</span>
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="nt">&quot;resourceCounts&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="nt">&quot;crawlGood&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">10</span><span class="p">,</span>
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span><span class="nt">&quot;crawlBad&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span>
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w"> </span><span class="nt">&quot;replayGood&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">9</span><span class="p">,</span>
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="w"> </span><span class="nt">&quot;replayBad&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span>
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="p">}</span>
</code></pre></div>
<p>This data indicates that:</p>
<ul>
<li>When comparing <code>urn:view:&lt;url&gt;</code> records for crawl and replay, the screenshots are 95% similar.</li>
<li>When comparing <code>urn:text:&lt;url&gt;</code> records from crawl and replay WACZs, the text is 90% similar.</li>
<li>When comparing <code>urn:pageinfo:&lt;url&gt;</code> resource entries from crawl and replay, the crawl record had 10 good responses (2xx/3xx status code) and 0 bad responses (4xx/5xx status code), while replay had 9 good and 1 bad.</li>
</ul>
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