HTMLTableSectionElement

Tables table

Baseline: Widely available on the web, in every major browser since Jul 2015, and long enough to count on (since Jan 2018).

niso: Partial 82%. 135 of 163 subtests pass, by system: Linux 82%, macOS 82%. Engines: QuickJS, the engine niso's WPT run uses; Node and Porffor have no recorded run. WPT results recorded at f3b4fa8, 2026-11-10; web-features 3.45.0. WPT tests · niso's support · HTMLTableCaptionElement, HTMLTableCellElement, HTMLTableColElement, HTMLTableElement

HTMLTableSectionElement is an interface in idl/html.webidl, inheriting HTMLElement, exposed in Window. What it does is on MDN; this page says what niso has of it.

Status

The web features its members belong to, each with its Baseline status on the web and how much of the feature’s WPT suite passes in niso (see Web platform support).

Feature	On the web	In niso	Members
Tables	Widely available	Partial 82% 135 of 163 subtests pass	4

Members

constructor

constructor

[HTMLConstructor] constructor();

rows

attribute

readonly attribute HTMLCollection rows;

int32_t niso_html_table_section_element_get_rows(niso_dom* dom, niso_handle self, niso_handles* out);

insertRow()

operation

HTMLTableRowElement insertRow(optional long index = -1);

int32_t niso_html_table_section_element_insert_row(niso_dom* dom, niso_handle self, int32_t index, niso_handle* out);

deleteRow()

operation

undefined deleteRow(long index);

int32_t niso_html_table_section_element_delete_row(niso_dom* dom, niso_handle self, int32_t index);

Not in niso yet

Members the web has, by the BCD keys web-features 3.45.0 lists, that idl/ doesn’t declare. The list is partial: web-features lists only the keys it maps to a feature.

• align (Table styling)
• ch (Table styling)
• chOff (Table styling)
• vAlign (Table styling)