[helenius]

Remember to always (every time) set width/height for the <img> tag, otherwise it will fill the entire screen/container.

[ozaark]

Yes! Loading many sites without width/height set on mobile connections display a horrible jitter with logos and social icons polluting the entire screen initially.

[exodust]

In the case here with the Twitter logo, lack of height attribute causes the logo to look squashed on some oldish browsers. I imagine the addition of height would fix this.