I've been using the great function of QGIS: "map tips". It allows to include html-formatted text (and pictures) in order to popup a window by hovering features. I use map tips for a very convenient visualization of georeferenced pictures, as I presented once on digital-geography blog
But sadly I cannot make it woking anymore since (?) few weeks, I think since I updated QGIS to 2.16.1 (and later 2.16.2)! I'm always using the same code as before:
[%CONCAT('
(I know it can be written in an other way but this was working before...)
Now the frame popping up but there's just no picture 
Is that a consequence of the map tips improvements of QGIS 2.16? Is there a new syntax I'm missing? Or I might have something going wrong on my comp?
Anyone sharing the issue? Any ... tip?
Note that including an Iframe link works, I tried the code proposed by mbernasocchi answering to the question "How to view a video using map-tip QGIS 2.16" and it works great.
I'm working under Kubuntu 14.04
kdelibs: 4.13.3
Qt: 4.8.6
Core: 4.2.0-42-generic
System: 32 bit
Answer
you need to add the file:// prefix. The most portable way to use this (assuming you have the images in the same folder as the project) currently (tested on QGIS 3.2 - ubuntu) is:
you can also add width="300" and height="300" or so if needed
please note the @project_home this is a QGIS variable that is automatically set on each project thus allowing you to maintain relative paths
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