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<p>A <a href="#dfn-service-worker-registration">service worker registration</a> has an associated <dfn export id="dfn-active-worker">active worker</dfn> (a <a href="#dfn-service-worker">service worker</a> or null) whose <a href="#dfn-state">state</a> is either <em>activating</em> or <em>activated</em>. It is initially set to null.</p>
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<p>A <a href="#dfn-service-worker-registration">service worker registration</a> has an associated <dfn id="dfn-last-update-check-time">last update check time</dfn>. It is initially set to null.</p>
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<p>A <a href="#dfn-service-worker-registration">service worker registration</a> has an associated <dfn id="dfn-uninstalling-flag">uninstalling flag</dfn>. It is initially unset.</p>
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<p>A <a href="#dfn-service-worker-registration">service worker registration</a> has one or more <dfn id="dfn-service-worker-registration-task-queue" for="service worker registration">task queues</dfn> that back up the <a>tasks</a> from its <a href="#dfn-active-worker">active worker</a>'s <a>event loop</a>'s corresponding <a for="event loop">task queues</a>. (The target task sources for this back up operation are the <a href="#dfn-handle-fetch-task-source">handle fetch task source</a> and the <a href="#dfn-handle-functional-event-task-source">handle functional event task source</a>.) The user agent dumps the <a href="#dfn-active-worker">active worker</a>'s <a>tasks</a> to the <a href="#dfn-service-worker-registration">service worker registration</a>'s <a for="service worker registration">task queues</a> when the <a href="#dfn-active-worker">active worker</a> is <a href="#terminate-service-worker-algorithm">terminated</a> and <a lt="queue a task">re-queues those tasks</a> to the <a href="#dfn-active-worker">active worker</a>'s <a>event loop</a>'s corresponding <a for="event loop">task queues</a> when the <a href="#dfn-active-worker">active worker</a> spins off. Unlike the <a for="event loop">task queues</a> owned by <a>event loops</a>, the <a href="#dfn-service-worker-registration">service worker registration</a>'s <a for="service worker registration">task queues</a> are not processed by any <a>event loops</a> in and of itself.</p>
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<p>A <a href="#dfn-service-worker-registration">service worker registration</a> has one or more <dfn id="dfn-service-worker-registration-task-queue" for="service worker registration">task queues</dfn> that back up the <a>tasks</a> from its <a href="#dfn-active-worker">active worker</a>'s <a>event loop</a>'s corresponding <a for="/">task queues</a>. (The target task sources for this back up operation are the <a href="#dfn-handle-fetch-task-source">handle fetch task source</a> and the <a href="#dfn-handle-functional-event-task-source">handle functional event task source</a>.) The user agent dumps the <a href="#dfn-active-worker">active worker</a>'s <a>tasks</a> to the <a href="#dfn-service-worker-registration">service worker registration</a>'s <a for="service worker registration">task queues</a> when the <a href="#dfn-active-worker">active worker</a> is <a href="#terminate-service-worker-algorithm">terminated</a> and <a lt="queue a task">re-queues those tasks</a> to the <a href="#dfn-active-worker">active worker</a>'s <a>event loop</a>'s corresponding <a for="/">task queues</a> when the <a href="#dfn-active-worker">active worker</a> spins off. Unlike the <a for="/">task queues</a> owned by <a>event loops</a>, the <a href="#dfn-service-worker-registration">service worker registration</a>'s <a for="service worker registration">task queues</a> are not processed by any <a>event loops</a> in and of itself.</p>
<td>[<a href="#dfn-functional-events">Functional event</a>] The <a>http fetch</a> invokes <a href="#on-fetch-request-algorithm">Handle Fetch</a> with <var>request</var>. As a result of performing <a href="#on-fetch-request-algorithm">Handle Fetch</a>, the <a href="#dfn-service-worker-global-scope-service-worker">service worker</a> returns a <a for="fetch">response</a> to the <a>http fetch</a>. The <a for="fetch">response</a>, represented by a {{Response}} object, can be retrieved from a {{Cache}} object or directly from network using {{GlobalFetch/fetch(input, init)|self.fetch(input, init)}} method. (A custom {{Response}} object can be another option.)</td>
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<td>[<a href="#dfn-functional-events">Functional event</a>] The <a>http fetch</a> invokes <a href="#on-fetch-request-algorithm">Handle Fetch</a> with <var>request</var>. As a result of performing <a href="#on-fetch-request-algorithm">Handle Fetch</a>, the <a href="#dfn-service-worker-global-scope-service-worker">service worker</a> returns a <a for="fetch">response</a> to the <a>http fetch</a>. The <a for="fetch">response</a>, represented by a {{Response}} object, can be retrieved from a {{Cache}} object or directly from network using {{WindowOrWorkerGlobalScope/fetch(input, init)|self.fetch(input, init)}} method. (A custom {{Response}} object can be another option.)</td>
<td>[<a href="#dfn-functional-events">Functional event</a>] The <a>http fetch</a> invokes [[#on-foreign-fetch-request-algorithm]] with <var>request</var>. As a result of performing [[#on-foreign-fetch-request-algorithm]], the <a for="ServiceWorkerGlobalScope">service worker</a> returns a <a for="fetch">response</a> to the <a>http fetch</a>. The <a for="fetch">response</a>, represented by a {{Response}} object, can be retrieved from a {{Cache}} object or directly from network using {{GlobalFetch/fetch(input, init)|self.fetch(input, init)}} method. (A custom {{Response}} object can be another option.)</td>
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<td>[<a href="#dfn-functional-events">Functional event</a>] The <a>http fetch</a> invokes [[#on-foreign-fetch-request-algorithm]] with <var>request</var>. As a result of performing [[#on-foreign-fetch-request-algorithm]], the <a for="ServiceWorkerGlobalScope">service worker</a> returns a <a for="fetch">response</a> to the <a>http fetch</a>. The <a for="fetch">response</a>, represented by a {{Response}} object, can be retrieved from a {{Cache}} object or directly from network using {{WindowOrWorkerGlobalScope/fetch(input, init)|self.fetch(input, init)}} method. (A custom {{Response}} object can be another option.)</td>
<li>Set <var>workerGlobalScope</var>'s <a for="WorkerGlobalScope">type</a> to <var>serviceWorker</var>'s <a href="#dfn-type">type</a>.</li>
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<li>Create a new {{WorkerLocation}} object and associate it with <var>workerGlobalScope</var>.</li>
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<li>If <var>serviceWorker</var> is an <a href="#dfn-active-worker">active worker</a>, and there are any <a>tasks</a> queued in <var>serviceWorker</var>'s <a href="#dfn-containing-service-worker-registration">containing service worker registration</a>'s <a for="service worker registration">task queues</a>, <a lt="queue a task">queue</a> them to <var>serviceWorker</var>'s <a>event loop</a>'s <a for="event loop">task queues</a> in the same order using their original <a>task sources</a>.</li>
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<li>If <var>serviceWorker</var> is an <a href="#dfn-active-worker">active worker</a>, and there are any <a>tasks</a> queued in <var>serviceWorker</var>'s <a href="#dfn-containing-service-worker-registration">containing service worker registration</a>'s <a for="service worker registration">task queues</a>, <a lt="queue a task">queue</a> them to <var>serviceWorker</var>'s <a>event loop</a>'s <a for="/">task queues</a> in the same order using their original <a>task sources</a>.</li>
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<li>If <var>script</var> is a <a>classic script</a>, then <a lt="run a classic script">run the classic script</a><var>script</var>. Otherwise, it is a <a>module script</a>; <a lt="run a module script">run the module script</a><var>script</var>.
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<p class="note">In addition to the usual possibilities of returning a value or failing due to an exception, this could be prematurely aborted by the <a>kill a worker</a> or <a>terminate a worker</a> algorithms.</p>
<li>Set <var>serviceWorkerGlobalScope</var>'s closing flag to true.</li>
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<li>If there are any <a>tasks</a>, whose <a>task source</a> is either the <a href="#dfn-handle-fetch-task-source">handle fetch task source</a> or the <a href="#dfn-handle-functional-event-task-source">handle functional event task source</a>, queued in <var>serviceWorkerGlobalScope</var>'s <a>event loop</a>'s <a for="event loop">task queues</a>, <a lt="queue a task">queue</a> them to <var>serviceWorker</var>'s <a href="#dfn-containing-service-worker-registration">containing service worker registration</a>'s corresponding <a for="service worker registration">task queues</a> in the same order using their original <a>task sources</a>, and discard all the <a>tasks</a> (including <a>tasks</a> whose <a>task source</a> is neither the <a href="#dfn-handle-fetch-task-source">handle fetch task source</a> nor the <a href="#dfn-handle-functional-event-task-source">handle functional event task source</a>) from <var>serviceWorkerGlobalScope</var>'s <a>event loop</a>'s <a for="event loop">task queues</a> without processing them.
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<li>If there are any <a>tasks</a>, whose <a>task source</a> is either the <a href="#dfn-handle-fetch-task-source">handle fetch task source</a> or the <a href="#dfn-handle-functional-event-task-source">handle functional event task source</a>, queued in <var>serviceWorkerGlobalScope</var>'s <a>event loop</a>'s <a for="/">task queues</a>, <a lt="queue a task">queue</a> them to <var>serviceWorker</var>'s <a href="#dfn-containing-service-worker-registration">containing service worker registration</a>'s corresponding <a for="service worker registration">task queues</a> in the same order using their original <a>task sources</a>, and discard all the <a>tasks</a> (including <a>tasks</a> whose <a>task source</a> is neither the <a href="#dfn-handle-fetch-task-source">handle fetch task source</a> nor the <a href="#dfn-handle-functional-event-task-source">handle functional event task source</a>) from <var>serviceWorkerGlobalScope</var>'s <a>event loop</a>'s <a for="/">task queues</a> without processing them.
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<p class="note">This effectively means that the fetch events and the other functional events such as push events are backed up by the registration's task queues while the other tasks including message events are discarded.</p>
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</li>
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<li>Abort the script currently running in <var>serviceWorker</var>.</li>
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