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HTML attributes are often needed for various reasons. An attribute takes the basic form attribute="value", where combining multiple repeats this with attribute="value" attribute2="value2". Important points to realize: All table markup, except table end (|}), can have attributes added. Table and row markup ({| and |-) don't
A table is an arrangement of columns and rows that organizes and positions data or images. Tables can be created on Wikipedia pages using special wikitext syntax, and many different styles and tricks can be used to customise them.
Edit-tricks are most useful when multiple tables must be changed, then the time needed to develop complex edit-patterns can be applied to each table. For each table, insert an alpha-prefix on each column (making each row-token "|-" to sort as column zero, like prefix "Row124col00"), then sort into a new file, and then de-prefix the column entries.
The two most commonly used classes are "wikitable" and "wikitable sortable"; the latter allows the reader to sort the table by clicking on the header cell of any column. caption Required for accessibility purposes on data tables, and placed only between the table start and the first table row.
These two scrolling tables with row/column sticky headers are also automatically updated: Template:COVID-19 pandemic death rates; Template:COVID-19 vaccination data; See: Template talk:COVID-19 pandemic death rates#Automation of updates. Template talk:COVID-19 vaccination data#Automation of updates to this template.
See the Width section of Help:Table. To summarize, max-width is the preferred way to limit widths on tables. It works on divs too. Note though that in both tables and divs there needs to be spaces in long lines of text or wikitext. Otherwise there is no point at which that line can wrap.
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To clearly define relationships and avoid accessibility issues, use ! scope="colgroup" colspan="2" | when a column header spans two columns and ! scope="rowgroup" rowspan="2" | when a row header spans two rows, adjusting the number if spanning more. [WCAG 4]