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Embed Pro Flickr is a WordPress plugin designed to help you customize the Flickr images embedded on your website, especially when working with the Flickr Embed block inside the Gutenberg editor. 
It also takes cares of Flickr images embedded manually, especially before WordPress 5.0, ensuring consistency in the visitor experience, and without modifying the database.
It is aimed at Flickr photographers who are also WordPress bloggers, and particularly to those who have been using this combo over the years and seen breaking changes.
Expected impact:
<ul>
<li>Faster page load: visitors are only served the smallest image size necessary for their screen </li>
<li>More visually appealing: higher resolution images are made available to the browser, for example to visitors with Retina screens, thanks to the image sizes already processed by Flickr </li>
<li>Ensures visual consistency between images embedded manually from Flickr, images embedded using the Caption shortcode and images embedded using the Flick Embed block</li>
<li>Increased SEO by automatically using Flickr metadata to set titles and captions</li>
</ul>
Plugin features:
<ul>
<li>Systematically add classes to Flickr Embed blocks</li>
<li>Customize what happens when clicking on an image embedded with the Flickr Embed block </li>
<li>Assign the Flickr photo title to the tag</li>
<li>Make the Flickr photo page URL open in a new window</li>
<li>Automatically add a caption with the Flickr image title, and optionally hyperlink it</li>
<li>Make Flickr images responsive with <code>srcset</code> and <code>sizes</code> attributes, just like native WordPress images, improving the website loading time while serving better images to visitors. </li>
<li>Replace the hyperlinked Flickr page with the JPG image</li>
<li>Wrap lone <code><img></code> tags inside <code><figure></code> tags</li>
<li>Responsify caption shortcodes with fixed width, used in older version of WordPress</li>
</ul>
Plugin chracteristics:
<ul>
<li>Does NOT create new image sizes</li>
<li>Does NOT modify the database to operate. However, for debugging purposes, it can clear up cached oEmbed meta_keys in <code>wp_postmeta</code> faster than the 24-hour default</li>
<li>Lightweight (one single PHP page)</li>
<li>Has no visible component on the front end</li>
<li>Does not increase the site response time, provided a caching plugin is used</li>
</ul>
<h3>Configuration</h3>
To configure plugin, go to ‘Settings’ -> ‘Embed Pro Flickr’ from the WordPress dashboard

Embed Pro Flickr

Embed Pro Flickr helps you customize Flickr photos embedded in your WordPress site, improving user experience, performance and SEO.

Samuel Brynolf

Enables shortcode and a template tag to pull srcset-images by attachment-ID. This is way to complement WordPress built in srcset which (of course) focus on the_content images and media-sizes set in settings. Sometimes your layout demands more, or you are using other ways to put images on your site not using the_thumbnail or the_content. For example, I use Advanced Custom Fields a lot pulling images by ID.
Generated markup are built from a set of custom image-sizes and the, by you configured, (srcset-)sizes attribute. Use the settings-page for default values and override them any time in the shortcode or template tag.
<ul>
<li>Option: Generate shortcodes by the mediauploader-button. </li>
<li>Option: Enable simple lightbox functionality. </li>
<li>Option: Enable lazhyloading. Option: Include Picturefill</li>
</ul>
Full documentation at <a href="https://samuelbrynolf.se/2016/04/wordpress-plugin-make-it-srcset/" title="Wordpress plugin: Make it Srcset" rel="nofollow ugc">WordPress plugin: Make it Srcset</a>

Make it Srcset

Wordpress already uses srcset now. What I missed out was a simple way to handle and customize the sizes attribute—in my opion what makes srcset so eff …

Embed Pro Flickr vs Make it Srcset