Tham khảo tài liệu 'tự học html và css trong 1 giờ - part 33', công nghệ thông tin, đồ họa - thiết kế - flash phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 296 lesson 10 Building Tables td 10mm td td 5-7mm td td rowspan 2 5-7mm td tr tr style text-align center td style text-align left Models with AC td td 12mm td td 6-8mm td tr tr style text-align center th colspan 2 style text-align td td td td td 6-8mm td tr table body html left Power Steering Oil Pump th NOTE__ Under normal circumstances avoid the use of the style attribute and instead use a style sheet for the page and apply classes where necessary to style your table. Using the style attribute is the least efficient way to apply styles to a page but it makes the example more readable. More Advanced Table Enhancements Tables are laid out row by row but HTML also provides some elements that enable you to group cells into columns and modify their properties. There are also elements that enable you to group the rows in tables to manage them collectively as well. Grouping and Aligning Columns Sometimes it s helpful to apply styles to the columns in your tables rather than applying them to individual cells or to rows. To do so you need to define the columns in your table with the colgroup and col elements. The colgroup . colgroup element is used to enclose one or more columns in a group. The closing colgroup tag is optional in HTML but it s required by XHTML. This element has two attributes span defines the number of columns in the column group. Its value must be an integer greater than 0. If span isn t defined the colgroup element defaults to a Download from More Advanced Table Enhancements 297 column group that contains one column. If the colgroup element contains one or more col elements described later however the span attribute is ignored. width specifies the width of each column in the column group. Widths can be defined in pixels percentages and relative values. You also can specify a special width value of 0 zero followed by an asterisk . This value specifies that the width of each column in the group should be the minimum .
