html attributes

In HTML and CSS, an ID (identifier) is a unique attribute used to identify an individual element on a webpage. Each ID must be unique within the document, distinguishing one element from all others.

To merge columns and rows in an HTML table, you can use the colspan and rowspan attributes within the or elements. These attributes allow you to span a cell across multiple columns (colspan) or rows (rowspan). Here's an example demonstrating how to merge cells in an HTML table: