WordPress/wp-includes/css/dist/format-library/style.css

.editor-format-toolbar__link-container-content{display:flex}.editor-format-toolbar__link-container-value{margin:7px;flex-grow:1;flex-shrink:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:150px;max-width:500px}.editor-format-toolbar__link-container-value.has-invalid-link{color:#d94f4f}