hframe 0.4.1

Show HTML content "inside" your egui rendered application
Documentation 
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use web_sys::wasm_bindgen::JsCast;

pub(crate) struct ComposedArea {
    /// The egui id used to track this area. It should be a LayerId's id, not a
    /// widget id.
    pub(crate) id: egui::Id,
    /// Whole rect of the egui rendered area.
    pub(crate) rect: egui::Rect,
    pub(crate) html: Option<ComposedHtml>,
}

pub(crate) struct ComposedHtml {
    pub(crate) id: String,
    pub(crate) content: String,
    pub(crate) status: ComposedHtmlStatus,
    /// Rect where the HTML content should be placed.
    pub(crate) rect: egui::Rect,
}

impl ComposedHtml {
    pub(crate) fn to_outer_html(&self) -> String {
        let id = &self.id;
        let content = &self.content;
        let styles = self.to_styles();

        format!(r#"<div id="{id}" class="hframe-composed-area" style="{styles}">{content}</div>"#)
    }

    pub(crate) fn to_styles(&self) -> String {
        let top = self.rect.min.y;
        let left = self.rect.min.x;
        let width = self.rect.width();
        let height = self.rect.height();
        let status = self.status.to_styles();

        format!("top: {top}px; left: {left}px; width: {width}px; height: {height}px; {status}")
    }

    pub(crate) fn get_element(&self) -> web_sys::Element {
        let window = web_sys::window().unwrap();
        let document = window.document().unwrap();
        document
            .get_element_by_id(&self.id)
            .expect("Composed HTML area was not found in the document")
    }

    pub(crate) fn get_html_element(&self) -> web_sys::HtmlElement {
        self.get_element()
            .dyn_into::<web_sys::HtmlElement>()
            .unwrap()
    }
}

pub(crate) struct ComposedHtmlStatus {
    pub(crate) visible: bool,
    pub(crate) interactive: bool,
}

impl ComposedHtmlStatus {
    pub(crate) fn to_styles(&self) -> String {
        let interactive = if self.interactive {
            ""
        } else {
            "pointer-events: none;"
        };
        let visible = if self.visible {
            ""
        } else {
            "visibility: hidden;"
        };

        format!("{interactive} {visible}")
    }
}