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In HTML syntax, an attribute is added to a HTML start tag. Several basic attributes types have been recognized, including: (1) required attributes needed by a particular element type for that element type to function correctly; (2) optional attributes used to modify the default functionality of an element type; (3) standard attributes supported ...
align (Deprecated. use CSS instead.), noshade (Deprecated. use CSS instead.), size (Deprecated. use CSS instead.) and width (Deprecated. use CSS instead.) attributes on hr element; align (Deprecated. use CSS instead.), border, vspace and hspace attributes on img and object (caution: the object element is only supported in Internet Explorer ...
HTML attributes define desired behavior or indicate additional element properties. Most attributes require a value. In HTML, the value can be left unquoted if it does not include spaces (attribute=value), or it can be quoted with single or double quotes (attribute='value' or attribute="value"). In XML, those quotes are required.
However, for decades, HTML has had only limited options for easy alignment (one: <center>, which is now deprecated). A method for undenting the first word of a paragraph is to put the paragraph into a text-table, where the first word (or syllable) is (alone) in column 1, while the other text is in column 2.
Note: Wikipedia:HTML 5#Table attributes. CSS to replace obsolete attributes for borders, padding, spacing, etc. Add a border around a table using the CSS property border: thickness style color;, for example border:3px dashed red. This example uses a solid (non-dashed) gray border that is one pixel wide:
For these reasons, and in support of a more semantic web, attributes attached to elements within HTML should describe their semantic purpose, rather than merely their intended display properties in one particular medium.
Attributes and values go after the word gallery and a blank space, and before the ending angle bracket: <gallery attributes...> mode= traditional Default, effect is explained below; nolines No borders, less padding, captions centered under images; packed All images aligned by having same height, justified, captions centered under images
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.