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This practice frequently led to many tables nested within tables, as well as tables with unnecessary rows and columns. The use of graphic editors with slicing tools that output HTML and images directly also promoted poor code with tables often having many rows of 1 pixel height or width.
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. Also, note that the <thead>, <tbody>, <tfoot>, <colgroup>, and <col> elements are not supported in wikitext.
Explicit table captions (or titles) are recommended for data tables as a best practice; the Wikipedia Manual of Style considers them a high priority for accessibility reasons (screen readers), as a caption is explicitly associated with the table, unlike a normal wikitext heading or introductory sentence. All data tables on Wikipedia require ...
Tables are a common way of displaying data. This tutorial provides a guide to making new tables and editing existing ones. For guidelines on when and how to use tables, see the Manual of Style. The easiest way to insert a new table is to use the editing toolbar that appears when you edit a page (see image above).
It is considered better practice to use an element's id or class attributes to select the element from within a stylesheet, though sometimes this can be too cumbersome for a simple, specific, or ad hoc styling. The title attribute is used to attach a subtextual explanation to an element. In most browsers this attribute is displayed as a tooltip.
Also, if the table has cell spacing (and thus border-collapse=separate), meaning that cells have separate borders with a gap in between, that gap will still be visible. A cruder way to align columns of numbers is to use a figure space   or  , which is intended to be the width of a numeral, though is font-dependent in practice:
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An example table rendered in a web browser using HTML. A table is an arrangement of information or data, typically in rows and columns, or possibly in a more complex structure. Tables are widely used in communication, research, and data analysis. Tables appear in print media, handwritten notes, computer software, architectural ornamentation ...