CSSメモ

width: fit-content;

Chrome 46-, Firefox 94-

box-sizing: border-box; padding-right: 2rem;
p width: auto
p width: 100%
p width: fit-content;

text-overflow: ellipsis;

MDN Web Docs

width: 14rem; text-overflow: ellipsis; overflow: hidden; white-space: nowrap;
↓

width: 14rem; text-overflow: ellipsis; overflow: hidden; white-space: nowrap;

text-decoration: underline;

• text-decoration-line: underline; text-decoration-style: wavy;
• underline wavy 4px red
• underline 0.6rem #660; text-underline-offset: -0.6rem;

Palemoon、Mypal68で非対応なのは

• text-decoration: での一括指定
• text-decoration-thickness:
• text-underline-offset:

Tooltip title属性

<p title="title">