See File:Screenshot pie graph error mobile.png on Commons
The pie chart at enwp English_language#Pluricentric_English doesn't get drawn correctly on my mobile device. Code that generated the chart is:
{{Pie chart |caption=Pie chart showing the percentage of native English speakers living in "inner circle" English-speaking countries. Native speakers are now substantially outnumbered worldwide by second-language speakers of English (not counted in this chart). |other=yes |value1={{#expr:231/359*100 round 1}} |label1=US |color1=#BF0A30 |value2={{#expr:60/359*100 round 1}} |label2=UK |color2=#003399 |value3={{#expr:19/359*100 round 1}} |label3=Canada |color3=#FF0000 |value4={{#expr:17/359*100 round 1}} |label4=Australia |color4=#008751 |value5={{#expr:4.8/359*100 round 1}} |label5=South Africa |color5=#FCB514 |value6={{#expr:3.8/359*100 round 1}} |label6=Ireland |color6=#008000 |value7={{#expr:3.7/359*100 round 1}} |label7=New Zealand |color7=#000000 }}
I'm using Chrome for Android version 78.0.3904.96