async getArtifact(context) {
    const devtoolsLog = context.dependencies.DevtoolsLog;
    const fromDOM = await LinkElements.getLinkElementsInDOM(context);
    const fromHeaders = await LinkElements.getLinkElementsInHeaders(context, devtoolsLog);
    const linkElements = fromDOM.concat(fromHeaders);

    for (const link of linkElements) {
      // Normalize the rel for easy consumption/filtering
      link.rel = link.rel.toLowerCase();
    }

    return linkElements;
  }
@param {LH.Gatherer.Context<'DevtoolsLog'>} context
@return {Promise<LH.Artifacts['LinkElements']>}