set_layer_text

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Edit an existing text layer (text.<id>). Patches its text content, font, size, colour, and full type styling — pass only the fields you want to change. Does NOT create layers and does NOT touch image layers; use add_text_layer to make a new one. `font_family` is a Google Fonts family name (e.g. "Anton", "Bebas Neue"). `text_size` is the font size in px (omit to keep the current size). `text_color` is #rrggbb. Styling: font_weight (100-900, e.g. 800 for a black/heavy logo look), font_style (italic), text_transform (uppercase/lowercase), letter_spacing (px, may be negative for tight tracking), line_height (multiplier), text_align, text_autofit ("wrap" default = fixed size + word-wrap, the size you set is what renders; "fit"=auto-size to fill the box, grows and shrinks; "shrink"=legacy shrink-only), text_valign (top/middle/bottom block alignment), an outline via stroke_width + stroke_color, and a text_shadow. To make text MASK another layer (video/image-filled letterforms) use set_matte_source with this layer's id as the matte source. Only `elementId` is required.