Display only the borders between the rows:
The rules attribute is supported in Internet Explorer 9+, Firefox, Opera, Chrome, and Safari.
Note: The rules attribute of the <table> tag is not supported in Internet Explorer 8 and earlier versions.
Note: Chrome and Safari displays this attribute incorrectly: They add the affected outside borders in addition to the inside borders.
The <table> rules attribute is not supported in HTML5. Use CSS instead.
The rules attribute specifies which parts of the inside borders that should be visible.
For practical reasons, it may be better to not specify any rules, and use CSS instead.
|groups||Lines between row groups and column groups|
|rows||Lines between rows|
|cols||Lines between columns|
|all||Lines between rows and columns|
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