---
title: GlobalEventHandlers.onloadstart
slug: Web/API/GlobalEventHandlers/onloadstart
translation_of: Web/API/GlobalEventHandlers/onloadstart
---
<div>{{ApiRef}}</div>

<p>The <strong><code>onloadstart</code></strong> property of the {{domxref("GlobalEventHandlers")}} mixin is an {{event("Event_handlers", "event handler")}} representing the code to be called when the {{event("loadstart")}} event is raised (when progress has begun on the loading of a resource.)</p>

<h2 id="Syntax">Syntax</h2>

<pre class="syntaxbox"><var>img</var>.onloadstart = <var>funcRef</var>;
</pre>

<h3 id="Value">Value</h3>

<p><code>funcRef</code> is the handler function to be called when the resource's <code>loadstart</code> event fires.</p>

<h2 id="Examples">Examples</h2>

<h3 id="HTML_content">HTML content</h3>

<pre class="brush: html">&lt;img src="myImage.jpg"&gt;</pre>

<h3 id="JavaScript_content">JavaScript content</h3>

<pre class="brush: js">// 'loadstart' fires first, then 'load', then 'loadend'

image.addEventListener('load', function(e) {
  console.log('Image loaded');
});

image.addEventListener('loadstart', function(e) {
  console.log('Image load started');
});

image.addEventListener('loadend', function(e) {
  console.log('Image load finished');
});</pre>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{SpecName("HTML WHATWG", "webappapis.html#handler-onloadstart", "onloadstart")}}</td>
   <td>{{Spec2("HTML WHATWG")}}</td>
   <td>Initial definition</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_Compatibility">Browser Compatibility</h2>

<div>


<p>{{Compat("api.GlobalEventHandlers.onloadstart")}}</p>
</div>