Graphisme de Transparence Alpha de Fenêtre

A clean UI demonstration graphic on a solid black canvas illustrating transparency effects. The primary subject is a realistic front-facing window placed slightly left of center, featuring a glossy white frame with beveled edges, a slim bottom sill, and mullions dividing the glass into exactly four rectangular panes. The panes show a faint 50% opacity gray checkerboard transparency pattern beneath, accented by subtle light blue reflections and two diagonal glossy light streaks. A larger rectangular semi-transparent checkerboard pattern surrounds the window on the dark background to emphasize the alpha channel. At the top right, a rounded blue speech bubble displays the Japanese text "[窓枠と窓の画像、背景透過、窓の部分は50%のアルファ値とする]" in crisp white sans-serif typography. In the lower section, a small rounded dark UI button labeled "編集" sits at the bottom-left of the checkerboard area, and a circular dark button with a white share arrow icon appears at the bottom-right. Minimalist layout, sharp graphic presentation, no watermarks.