bug(table): the "sticky" input doesn't exist

[Gouvernathor]

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

This doc page says that

In order to fix the header row to the top of the scrolling viewport containing the table, you can add a sticky input to the matHeaderRowDef.

Adding the sticky attribute to the element carrying the matHeaderRowDef structural directive has no effect. Trying to pass [sticky] makes a parsing error since it is marked as not being a known property of . The name matHeaderRowDefSticky is suggested by the IDE but has the same behavior.

Reproduction

StackBlitz still doesn't work on firefox.

Expected Behavior

as described in the documentation

Actual Behavior

nothing

Environment

Angular CLI : 21.1.0
Angular : 21.1.0
Node.js : 24.12.0
Package Manager : npm 11.6.2
Operating System : win32 x64

[crisbeto]

You need to add the sticky input, not the attribute. There are some examples of how to set up the sticky behavior in the "Examples" tab, e.g. https://material.angular.dev/components/table/examples#table-sticky-header

[Gouvernathor]

Well, you should provide a link (in the doc section I quoted) about what you call an input, because I assumed it was like inputs in angular components, which pass through HTML attributes. Never saw that semicolon-in-string thing.