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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.
The easiest way to insert a new table is to use the editing toolbar that appears when you edit a page (see image above). Clicking the button will open a dialog where you define what you want in your new table. Once you've chosen the number of rows and columns, the wiki markup text for the table is inserted into the article.
Wikipedia has two kinds of lists: embedded lists (a list within a larger article), and standalone lists (an article that's only a list). An example of the latter is the article List of science fiction novels. Embedded lists are easier to grasp, both conceptually and in terms of formatting, although you won't have trouble understanding articles ...
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
Tables are a way of presenting information into rows and columns. Tables can be useful for various types of content on Wikipedia, but they should only be used when appropriate. In some cases, the information might be better conveyed in prose or as embedded lists. Overusing tables, especially with complex coding, can make pages harder to edit ...
English: This pictorial periodic table is colorful, boring, and packed with information. In addition to the element's name, symbol, and atomic number, each element box has a drawing of one of the element's main human uses or natural occurrences. The table is color-coded to show the chemical groupings.
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Tables will show the "[hide]" / "[show]" controls in the first row of the table (whether or not it is a header row), unless a table caption is present.(see § Tables with captions) Example with a header row