A selector identifies an HTML element. The screenshot picker generates one from the element you click; it does not monitor screen coordinates. Test extraction before saving.

• body: page text. Useful for keywords; may include navigation and other noise.
• article or main: the main content.
• #updated: the element with ID “updated”.
• .price: elements with the class “price”.
• main .price: price elements inside main.
• time[datetime]: time elements with a datetime attribute. Choose Attribute mode and attribute datetime.
• meta[property="article:modified_time"]: a page's hidden modification metadata, if provided. Choose Attribute mode and attribute content.
• a.download: a download link. Attribute href monitors changes to its address.

Keyword: use Text, selector body, rule “Keyword appears” and your phrase. Enable Ignore case if needed. It triggers absent → present; the first check is a baseline. Matching is a substring, so “available” also matches “unavailable”.

Other modes: Presence checks whether an element exists. JSON uses a JSON Pointer such as /status/updatedAt with the HTTP engine. Use Browser for JavaScript-loaded content. Exclude selectors remove noisy elements.

There is no universal updated-date selector. Dates and hidden metadata depend on the website and can be missing or inaccurate. HTTP headers such as Last-Modified and ETag are not supported watch modes here. A missing required selector produces an error and preserves the baseline.