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In this example, the scope attribute defines what the headers describe, column or row, which screen readers use. You can add a table using HTML rather than wiki markup, as described at HTML element#Tables. However, HTML tables are discouraged because wikitables are easier to customize and maintain, as described at manual of style on tables.
If you use tables for two-dimensional graphics you might discover a "feature" in HTML that promotes grey hair. It can affect both rows and columns, depending on the use of either rowspan or colspan. In this 7-row table three cells are assigned a rowspan of 3, but the table totals 6 rows. Where is row 4? There is a row 5-4!
Editors sometimes use headerless tables as an aid to content layout, especially where it is easier than the equivalent use of divs and CSS styling. For complex layouts, rowspan and colspan may be used, but again it is sometimes simpler and more maintainable to use nested tables. Nested tables must start on a new line.
The wikitext must be correct. An incorrect rowspan organization can break sorting, cause weird table formatting, move data to the wrong column, etc. See examples below. When sorted all the rows are filled. Tables without rowspan are much easier to maintain by less experienced editors, and by editors who are stopping by only once to edit the table.
For example, {{yes}} makes a cell with a green background. The text in the cell is taken from the first parameter ; {{ yes | Sure }} would output "Sure" otherwise it defaults to "Yes". Most templates allow authors to override the default text in this way, some require text put after the template call and some also need a vertical bar in between ...
Template:Sticky header/styles.css This template makes a table's column headers stick to the top of the screen as the table's data is scrolled in and out of view. It's used on tall tables that have column headers that might be difficult to remember as you scroll through the data.
This is the same as the maximum number of linearly independent rows that can be chosen from the matrix, or equivalently the number of pivots. For example, the 3 × 3 matrix in the example above has rank two. [9] The rank of a matrix is also equal to the dimension of the column space.
Example: If merging non-similar cells is essential, while not ideal, a work-around is to create a hidden column. This column can be given an appropriate heading name, that will not appear to sighted readers but will be recognized and read by screen readers. The following example is a snippet of a table from List of chronometers on HMS Beagle.