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I am using following code to display images in home page:

if ( has_post_thumbnail() ) {the_post_thumbnail('postbox-thumb')

But the output of the above code does not have height and width of the img tag. Please help me in solving this problem.

Current sample output:

<img alt="Kiran inspects coal mine" class="attachment-postbox-thumb wp-post-image" src="http://i0.wp.com/www.indiahelpdesk.in/wp-content/uploads/2012/08/HY09-KIRAN_1170869f.jpg?resize=229%2C150">

img height and width attributes are missing.

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Why do you need these attributes? If they are not given, the original size of the image is used. –  Horttcore Mar 12 '13 at 10:31
    
For better performance I need these attributes. –  user28789 Mar 12 '13 at 17:43
    
According to W3C (w3.org/TR/html401/struct/objects.html#h-13.7.1) you don't need them, except you want to overwrite them. And tbh I can't see why they should boost your page performance. If you want to improve your overall page performance, you should start somewhere else then the image attributes. If you still want to use them, see my answer below. –  Horttcore Mar 12 '13 at 17:51
    
I am following pagespeed recommendations –  user28789 Mar 19 '13 at 7:42
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1 Answer

In the 2nd attribute of the_post_thumbnail() you can give additional attributes for the image.

the_post_thumbnail( 'postbox-thumb', array( 'width' => 100, 'height' => 100 ) )

I've just checked it again the width and height are set in the latest WP Versions, so you might have just to update your WordPress installation.

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