=== Steps to Reproduce
# Visit https://en.m.wikipedia.org/wiki/2018_FIFA_World_Cup
# Scroll quickly to the bottom of the page
=== Expected Results
- Images load in place without shifting contents
=== Actual Results
- Images sometimes shift the contents horizontally and vertically:
{F23621457}
=== Environments Observed
**Browser Version **
- Chromium v66.0.3359.181
**OS Version**
- Ubuntu v18.04
**Device Model**
- Desktop
**Device Language**
- English
= Developer notes
Original HTML (ignoring noscript)
```
<span style="white-space:nowrap">
<span class="flagicon">
<span class="lazy-image-placeholder" style="width: 23px;height: 15px;" data-src="//upload.wikimedia.org/wikipedia/commons/thumb/c/ce/Flag_of_Tunisia.svg/23px-Flag_of_Tunisia.svg.png" data-alt="" data-width="23" data-height="15" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/ce/Flag_of_Tunisia.svg/35px-Flag_of_Tunisia.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/ce/Flag_of_Tunisia.svg/45px-Flag_of_Tunisia.svg.png 2x" data-class="thumbborder"> </span>
</span>
<a href="/wiki/Tunisia_national_football_team" title="Tunisia national football team">Tunisia</a>
</span>
```
is replaced with
```
<span style="white-space:nowrap">
<span class="flagicon">
<img class="thumbborder image-lazy-loaded" width="23" height="15" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/ce/Flag_of_Tunisia.svg/23px-Flag_of_Tunisia.svg.png" alt="" style="width: 23px;height: 15px;" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/ce/Flag_of_Tunisia.svg/35px-Flag_of_Tunisia.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/ce/Flag_of_Tunisia.svg/45px-Flag_of_Tunisia.svg.png 2x"> </span>
<a href="/wiki/Tunisia_national_football_team" title="Tunisia national football team">Tunisia</a>
</span>
```
The issue here is the thumbborder class adds a border to the image which changes the height and width of the image.
Let's ensure the lazy loaded image placeholder retains this thumbborder.
e.g.
```
<span class="lazy-image-placeholder"
```
becomes
```
<span class="lazy-image-placeholder thumbborder"
```
= Acceptance criteria
[] When creating the lazy-image-placeholder copy across the thumbborder class if it exists.
[] To minimise risk, do not copy across other classes, but let's ensure our solution allows expansion in future in case other classes need to be copied across