Deprecated in HTML5. Do not use.

<img start=””>

Attribute of
<img> HTML Tag
What does <img start=""> do?
Was used in conjunction with the dynsrc attribute to add a video that would load in supported browsers in the place of the image that would otherwise be displayed.

Images, Videos, and dynsrc

Before HTML supported native video playback, one of the early attempts for accommodating video into HTML documents was by overloading the <img> element with a video file. The video file was specified in a special attribute called dynsrc (dynamic source). The idea was that if your browser supported dynsrc video playback, you would see the video — otherwise, you would just see the image as specified in the src attribute.

<!-- This will not work in any browser. You will just see the static image. -->  <img src="/wp-content/uploads/flamingo.jpg" dynsrc="wp-content/uploads/flamingo-movie.mp4"> 

The start attribute

The start attribute allowed you to specify an event which would trigger the video to begin playback. For example, you could indicate that the movie should play as soon as the browser finishes opening the file:

<!-- This will not work in any browser. You will just see the static image. -->  <img src="/wp-content/uploads/flamingo.jpg" dynsrc="wp-content/uploads/flamingo-movie.mp4" src="fileopen"> 

None of this matters anymore, because the dynsrc attribute, and all related features have been deprecated in HTML5.

The HTML5 Way to Embed Video

Embedding video today is as easy as using the new <video> element. You can even specify an image as a fallback, in case the browser doesn’t support HTML5 video.

<video controls>  <!-- One or more video sources. The browser will select the best option. -->  <source src="/wp-content/uploads/flamingo-movie.mp4">   <!-- Anything outside of a source element will be seen if HTML5 video is not supported. -->  <img src="/wp-content/uploads/flamingo.jpg" alt="Fallback Flamingo."> </video> 

For more information about HTML5 video, see our documentation on the <video> and <source> elements, as well as our tutorial on Media in HTML5.

Autoplay on HTML5 Video

The closest equivalent to the start attribute in HTML5 video is the autoplay attribute. When present, the video will begin playing immediately.

<video autoplay>  <!-- One or more video sources. The browser will select the best option. -->  <source src="/wp-content/uploads/flamingo-movie.mp4">   <!-- Anything outside of a source element will be seen if HTML5 video is not supported. -->  <img src="/wp-content/uploads/flamingo.jpg" alt="Fallback Flamingo."> </video> 

Values of the start Attribute

Value Name Notes
fileopen Indicated that the video defined in the `dynsrc` attribute should begin playback immediately. The `dynsrc` method of video play back has been deprecated.
mouseover Indicated that the video defined in the `dynsrc` attribute should begin playback when the user mouses over the video pane. The `dynsrc` method of video play back has been deprecated.

All Attributes of img Element

Attribute name Values Notes
height Identifies the intrinsic height of an image file, in CSS pixels.
srcset list of sources Defines multiple sizes of the same image, allowing the browser to select the appropriate image source.
align right
left
Was previously used to specify the alignment and placement of an image relative to the surrounding text. It has been deprecated and should not be used.
alt text Defines alternate text, which may be presented in place of the image.
border pixels Previously used to define a border on an image element. It has been deprecated and should no longer be used.
controls Toggled media player controls when used in conjunction with the <code>dynsrc</code> attribute. Both attributes are now deprecated.
dynsrc
hspace Previously used to add horizontal space on both side of an image. It is now deprecated.
ismap Identifies an image as a server-side image map. When the containing anchor link is clicked, the coordinates of the mouse will be included in the request.
longdesc Defines a URL at which can be found more information about the image. It was written out of the HTML5 specification, but its status is not quite so clear as other deprecated features.
loop Previously used to specify the number of times a video should play, when used in conjunction with the dynsource attribute. Both attributes have been deprecated.
lowsrc Specified a smaller or lower-quality version of an image.
name Identified the image or provided additional information about it. Deprecated in HTML 4.0 in favor of other attributes.
naturalsizeflag This attribute does nothing. It was once used by a proprietary software system.
nosave Was intended to prevent users from downloading an image. Was never a part of the HTML specification, and not widely implemented.
start fileopen
mouseover
suppress Used by the now-defunct Netscape browser to suppress the display of image prior to image download completion.
usemap Specifies a client-side image map to be used with the image.
width Indicates the intrinsic width of the image, in CSS pixels.
src Specifies the URL of an image to be displayed.
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Browser Support for start

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